There are lots of strains that the breeders claim are 60 day strains. However I have found that the real time it takes is is not always as claimed by the breeders. That said here are a few quick choices.
Critical - Royal Queen seeds, 50 to 60 day strain
Vanilla kush - Barneys farm - 60 to 65 days
Raw Diesel - G-13 labs - 58 day strain
Do a search at seedfinder.eu to narrow down your choices
