When to Complete SB w/Garbage

How many limpers does it take to make completing the SB with a poor hand +EV?

I had Q2o in SB with 6 limpers. I folded (was playing a tricky hand for big pot at another table). BB completed. 7 players to the Flop.

Flop would have given me top two pair, also putting a 2-flush on board. The 2 paired on the Turn and also made a 3-flush. There was tons of action and pot ended up being ~14BBs. Of course, the probability of the hand playing out like this is minimal.

So generally speaking, what is the # of limpers that give you enough odds (pot & implied) to complete with a weak hand? What are some table considerations that would alter that #? (eg BB is super aggressive & most likely will raise PF facing limpers.)

SP