Documentary wedding photographers generally don’t focus too much on overly creative, posed couples’ portraits. If you want it, they’ll normally allow about 20 minutes to take some natural wedding photographs, this is long enough to be a nice break and to get the shots without feeling like you’re missing out on the celebrations. The best time for this is golden hour (the time around sunset where the sunlight is just stunning), however you should talk to your photographer and make it work around your timetable to ensure the least amount of disruption to your day.
The best documentary photographers will keep photographs natural and fun, perhaps choosing somewhere with a beautiful backdrop, having a chat about your day so far and get some natural candid images. They will vary in the level of instruction and posing they give but will tend to stay away from anything to formal and posed.