Personally I plan to run each major bot release indefinitely, or at least until it drops off (for example, at some point I’ll stop looking at v4.3 and only look at v5.0 and the next version).
I place these bots on a VPS with a realistic broker similar to prop firms but on a non-expiring account. For example I’m currently using OspreyFX demo accounts (tight spread ECN broker, unsure if these accts expire). In these demo accounts I am “screening” the bots performance and I set them all to use 0.01 lots, so the accounts will never exceed any limits. Because the lot size is hardcoded to 0.01 on all bots, you cannot compare them against each other for account gains, but you can compare them for accuracy of trade (for example I look at pips gained and profit factor).
The accounts are connected to MyFXBook and I should be able to share them publicly. I also tried FX Blue but I’m not happy with their clunky interface. Seems like same metrics in MyFXBook so that’s probably where I’ll continue.