How many total hours were you expecting for photography?
What time would you like the photographer to start taking photos and what time do photos end?
If we're taking getting ready photos, I like to arrive when the couples are around 50% done with their makeup and/or hair. That way I'll start on detail shots and the day moves on from there.
For photography end time, typically most photographers leave after getting photos of the main parts of the reception. For example, they pack up and leave after any traditions or special performances.
But let me know what you were looking for!