There is really no telling. Now stretches are good, and I'd never tell anyone not to stretch, but if you are doing it for quats, I don't think thats good enough. It's been my personal experience that if you need flexibility for a certain movement, well stretches can certainly help, but the best approach is to do the movement. Start with an empty bar, do several sets of a couple of reps (no need for volume here) and try to go deeper each time out. It can be done every day, several times a day, because there is no significant loading involved. If you need some weight for stability, then add a ten lb plate or so on each side. I've known people who really couldn't get a true feel for it without adding a bit of weight to the empty O bar. When teaching O lifting, we took the 3 major moves that give you the most flexibility needed for that sport, front and overhead squats, and RDL's, gave the kids empty bars and had them do them every session until they got the positioning correct. Once there, then we started putting weight on the bar and bringing them up slowly. Most were on there way within 2-3 weeks. Again, stretches are great, but to learn a particular move,use the move and use stretches as assistance.
Do what Tim says. I have done exactly that with overhead squats and improved my ROM.
I would also like to suggest that you stretch BEFORE you perform the movement. Stretch your hip flexors, calfs and any other problem areas. before each set of squats.
Current trends are not use static stretching BEFORE lifting, but in a situation like yours it only makes sense.