This is a hard one and varies from wedding to wedding. Some couples want photography coverage of the entire day, from the bride and her girls getting ready to the happy couple’s final getaway; others are content with a few posed portraits and coverage of just the ceremony and reception. Generally I recommend allowing about 45 minutes for posed photos of the bridal party and family, and half an hour for posed photos of just the bride and groom. These photos may take more or less time, but it’s important for you not to feel rushed, and for me to set up properly and take the best photos possible!
Work backward from the start time of your ceremony/reception and figure out how much time you’ll need to prepare, if your first look will be walking down the aisle or beforehand, whether to do posed portraits before or after the ceremony, and what are the key moments you want captured. Give yourselves margin! It can also be helpful to create a shot list of your must-have photos, particularly when it comes to groupings of family members (i.e. bride/groom with both sets of parents, bride/groom with grandparents, bride with just her siblings, etc.).