# SAP Transport Import Window Calculator

> Source: https://netray.co/tools/sap-transport-import-window-calculator
> Publisher: Netray (netray.co), AI and integration engineering for ERP and manufacturing systems.
> Section: Free Tools

## Short answer

Estimate how long a queue of transport requests will take to import and how many fit inside your production change window.

## Category

sap

## Erp

SAP ECC and S/4HANA

## Audience

- SAP Basis administrator
- Release manager

## Tool

**Kind:** calculator

**Inputs:**

#### Transport requests in the queue

**Key:** transports

**Type:** number

**Default:** 60

**Min:** 0

**Step:** 1

**Unit:** requests

#### Average import time per request

**Key:** avg_import

**Type:** number

**Default:** 3

**Min:** 0

**Step:** 0.5

**Unit:** min

**Help:** Take the median from the STMS import history for similar requests.

#### Share of requests needing a re-import

**Key:** fail_pct

**Type:** number

**Default:** 5

**Min:** 0

**Max:** 100

**Step:** 1

**Unit:** %

**Help:** Include return code 8 and 12 repeats, missing objects and ordering fixes.

#### Fixed post-import work

**Key:** post_min

**Type:** number

**Default:** 45

**Min:** 0

**Step:** 5

**Unit:** min

**Help:** Generation, buffer sync, smoke tests, background job restart.

#### Change window length

**Key:** window_h

**Type:** slider

**Default:** 6

**Min:** 1

**Max:** 24

**Step:** 1

**Unit:** hours

**Outputs:**

#### Base import time

**Key:** base_min

**Expr:** transports * avg_import

**Format:** minutes

#### Re-import time

**Key:** retry_min

**Expr:** transports * fail_pct / 100 * avg_import

**Format:** minutes

#### Total elapsed time

**Key:** total_min

**Expr:** base_min + retry_min + post_min

**Format:** minutes

**Primary:** true

#### Window utilisation

**Key:** util

**Expr:** total_min / (window_h * 60) * 100

**Format:** percent

**Primary:** true

#### Maximum requests that fit

**Key:** max_tr

**Expr:** max(0, floor((window_h * 60 - post_min) / (avg_import * (1 + fail_pct / 100))))

**Format:** integer

#### Spare time in window

**Key:** spare

**Expr:** window_h * 60 - total_min

**Format:** minutes

**Description:** Negative means the plan overruns the window.

**Chart:**

#### Total elapsed minutes vs number of requests

**Type:** line

**X:** transports

**From:** 5

**To:** 200

**Steps:** 40

**Series:**

- total_min

**Disclaimer:** Planning model. Imports run serially in a single queue in this model; parallel import tools and mass activation strategies change the numbers.

## Content

**Intro:** Release weekends overrun when the plan assumes every import works the first time. This calculator adds a re-import allowance and fixed post-import work, then tells you how many transport requests actually fit in the window.

**Sections:**

#### How to use it

**Body:** Count the requests in the import queue for the target system. Use the median import duration from your own STMS import history rather than the best case, then add the share of requests that you expect to repeat. Enter the fixed work that happens regardless of request count, such as generation, buffer refresh and smoke testing. The tool reports total elapsed time, utilisation of your window and the maximum number of requests that fit.

**Bullets:**

- Use history for the same request types, workbench and customizing differ
- Large DDIC changes take far longer than a report change
- Keep at least 20 percent of the window as slack
- Sort the queue so dependent requests import in order

#### The arithmetic

**Body:** Total time equals requests times average import time, plus the re-import share of that same product, plus the fixed post-import allowance. Window utilisation divides that by window minutes. The maximum fit formula solves the same equation for the request count: available minutes after the fixed work, divided by the effective minutes per request including expected repeats. It is deliberately simple so every term can be checked against the import log.

#### Worked example

**Body:** 60 requests at 3 minutes is 180 minutes. A 5 percent repeat rate adds 9 minutes. With 45 minutes of post-import work the total is 234 minutes, or about 65 percent of a 6 hour window. The maximum that fits is about 100 requests. If your history shows a 15 percent repeat rate and a 5 minute average because of table conversions, the same 60 requests take about 390 minutes, which does not fit, and the plan needs splitting across two windows.

#### Common mistakes

**Body:** Teams often use the average of all imports, which hides long tail requests with table activation or conversion. Others forget that a failed import can block everything behind it in the queue. Also remember that application server load from batch jobs, or imports during period end, can lengthen every request. Use the chart to find the point where the plan starts to cross the window and agree a cut line with the change board in advance.

**Cta:** If you want import histories analysed automatically from your own landscape, with the queries visible and no data leaving your network, Netray can discuss an on-prem assistant for Basis.

**Faq:**

#### Where do I find the average import time?

**Answer:** The STMS import history and the transport log show start and end times per request. Export them for the last few releases, filter to the same target system and use the median. Do not mix customizing and workbench requests with large conversions.

#### Does this work for parallel imports?

**Answer:** The model is serial. If you use parallel import options, divide the base import time by an effective parallelism you have measured, not the theoretical number, since dependencies and database locks reduce the gain.

#### What repeat rate should I assume?

**Answer:** Use your own last three releases. For a well-prepared release, a few percent is common. For first time imports into a new system or after a long freeze the rate can be much higher, so raise it.

#### Does it include testing time?

**Answer:** Only the fixed post-import allowance. Add business verification and regression testing to your overall plan separately, since they usually run after the import queue finishes and have their own sign-off.

## Search terms

sap transport import time calculator, sap change window planning, sap release weekend planning, how long to import transports sap, stms import queue time estimate, sap transport capacity per window, sap production import planning, sap cutover time estimate

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