It really depends on a lot of things, as Jay said in his comment, not just the preparation of the pie (its depth, the amount of liquid/goop, whether it's covered) but also personal preferences, and the crispness of the apples you've decided to use.
Use a recipe as a guideline, and then check it periodically as it approaches the end time. If the apples aren't cooked enough for you and the crust is starting to brown, you can cover it loosely with foil to protect it. Remember what worked for the next time, and you should be set.