It depends on a lot. Usually I'll stealth camp and if I find a great spot and I've covered a good distance and I'm loaded with water or have access to water then I'll stop no mater the time. The same would go if I'm paying for camping but I rarely do that. Sometimes it's so hot out though that I'll just keep riding until evening because I don't feel like hanging out in a baking hot tent or sitting out with the mosquitoes. Only a couple times I've camped in places that I wouldn't set up until after dark to keep it stealthy.