I quarantine for 90 days. Do not share any utensils between animals (tongs, etc) and make sure you wash your hands and keep the QT animals off your clothes if you're going to be handling your other animals. I always suggest cleaning/handling/etc your previous animals first then moving to your QT animals to prevent contamination.

Also, be prepared for the leos to possibly not get along. Females can cohabitate but not always - they can be territorial and aggressive like males (I have several females that CANNOT be housed with any others.) Make sure your animals are of similar size/weights before introducing them and verify the sex of each. (Two males will fight and try to kill one another). If you notice bullying (this includes injuries, hogging food, hogging hides, etc) then you will have to keep them separate.

Good luck.