Since this has been brought up again.
https://www.strawpoll.me/21258522

It's important to note that there are RTA-IGT differences of nearly 10 minutes between some runners.
Liquid506's RTA-IGT difference = 39:58
YHI_Zuikaku's RTA-IGT difference = 57:33

Here's my planned rules if IGT is favored:

Quote

Timing for this game is In-Game Time (IGT).
You can figure out your time by:
- Checking your total mission time at the end of a New Game run.
- Keeping track of your mission time before a NG+ run, and subtracting it from the total afterwards.
- Searching through the video and adding up the times from the debriefing sections.

The reasoning for ranking by IGT is give everyone a fair comparison across different levels of hardware.
It is still expected for all runners to play with a similar level of urgency as a Real time (RTA) run.
While IGT favorable strategies are allowed (such as spending extra time to setup optimal planes per mission), taking advantage of the timing for other reasons (like planned breaks) is not.

Runners MUST submit BOTH Real time and In-game time for their Full game runs.
*Moderation will help if needed to add up IGT. Just make sure that all mission times are visible in the submitted video, including the debriefing for M20.

If there is a large enough discrepancy between Real time & IGT, then the run will be subject to scrutiny and possible rejection.