I just did some stoving. I'm assuming the limpers are 25/5 so that, in limping, they are playing their best 25% with the very best 5% pulled out, and that the laggy raiser is raising with her best 20%. The big blind is playing ATC.
4,518,462 games 72.953 secs 61,936 games/sec
Board:
Dead:
equity win tie pots won pots tied
Hand 0: 12.335% 11.08% 01.26% 500481 57129.79 { 88-66, A9s-A2s, KJs-K6s, Q9s, J8s, T8s, AQo-A7o, K9o+, JTo }
Hand 1: 12.327% 11.07% 01.26% 500388 56867.38 { 88-66, A9s-A2s, KJs-K6s, Q9s, J8s, T8s, AQo-A7o, K9o+, JTo }
Hand 2: 12.316% 11.06% 01.26% 499904 56870.96 { 88-66, A9s-A2s, KJs-K6s, Q9s, J8s, T8s, AQo-A7o, K9o+, JTo }
Hand 3: 12.328% 11.08% 01.25% 500615 56696.13 { 88-66, A9s-A2s, KJs-K6s, Q9s, J8s, T8s, AQo-A7o, K9o+, JTo }
Hand 4: 12.343% 11.09% 01.26% 501204 56794.54 { 88-66, A9s-A2s, KJs-K6s, Q9s, J8s, T8s, AQo-A7o, K9o+, JTo }
Hand 5: 14.764% 13.50% 01.27% 609936 57467.04 { 66+, A4s+, K8s+, Q9s+, J9s+, T9s, A9o+, KTo+, QTo+, JTo }
Hand 6: 12.330% 11.72% 00.62% 529379 27996.79 { random }
Hand 7: 11.256% 10.43% 00.83% 471388 37471.37 { QTo }
QTo is very close to a 9:1 equity dog against these ranges. Getting 9.5:1 is a very slight overlay. (Against 7 random hands, QTo is an 85:15 dog (5.7:1)) so would be getting an overlay for any number of bets.)
The details are going to depend on how many of their best hands the limpers are going to limp with. The more of the top of their range they play, the worse off QTo is going to be; the lower down their range extends, the better of QTo is.
This suggests (not proves) that calling QTo in the SB here is close, and so considerations such as playability and position and our hero's postflop skills are going to play a role in the decision.