Plenty of strains take more than 10 weeks to mature.
Probably a lot more than the seed vendors would like to admit in their description.
Sweet Tooth and ECSD, two different extremes.
One 6, One 11
Lots of examples out there
You see so many descriptions of strains that say, "finishes between 8 and 10 weeks", right? But, what finishes faster than eight weeks or takes much longer than ten? In other words, isn't saying "finishes between 8 and 10 weeks" pretty useless?
Bingo!!! Every time I read 55-65 days on a seed pack I think to myself, well 10 week finisher she is then. Probably get lucky and get one fast one in your pack. Personally never seen a strain that wouldn't be better if you left it an extra week from what the "breeder" says.