Depends on three things: How they were acclimated, how they are kept, and individuality. Also the part of the year they were brought in. You want them to have 100% privacy. The imports I keep for myself are in cages that have no see through door. They can't see me, and I can't see them. I also give them alot of substrate, literally mounds of aspen. And of course my tried and true 120-130 degree basking spot. I've held a few Females that came in early this year, just to see if I could get them to cycle the following season. I'm thinking one is already gravid, without any captive help. I've done it before, but I'm really going to focus on them now that I've taken on the Boa thing full time, so more to come on this next year. Oh, and remember, low pressure systems are your friend. I base my initial pairing on a real strong LP systems, it usually results in instant gratification, but doesn't necessarily guarantee results.
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South Central Herpetological