After the first time it takes about 10-15 minutes from opening the bag to tensioning the last guy rope :))))
We have 3 teens, 2, adults and a dog and have plenty of room, but we do use a 4 meter bell as a utility/kitchen tent when away for longer than 4 days so it depends on your style of camping, we are fairly minimal.
We put ours up in 10 mins easy with two, 15 just me, I'm only small! But then, it can take ages filling it full of comfy stuff, but at least you are inside, dry and warm. We use ours with just two adults and two smallish dogs and have loads of lovely room to live in. Tend to cook outside under the tarp, or inside if it's really foul. Depending where you are, bell tent have moved premises and apparently have some up on display now, but they are in London. If you decide to get one, I'm sure you will love it. Soooo comfy, spacious, and quiet.
Amazing family weekend with old steam engines, classic car displays, market stalls, and full catering and bar. And camping on site - Save £25 by booking in advance.