Tip: When determining a time limit, remember that players won't be as familiar with the level as you are. If you normally complete the level with around 100s left on the timer, others might run out of time on their first try.
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Important note: Since October 7th, 2018 the patches section has been ongoing a full fledged remoderation to convert patches to Asar and SA-1, as well as to do UberASM conversions of certain patches and some other quality control - further details here. If a patch you were searching for was removed, please check this thread to get a(n unconverted) backup.