How long you feel ok about leaving them in the coop depends TOTALLY on your coop arrangements. The larger (meaning, more oversized to what people around here usually build) and more pleasant and better-ventilated your coop is, the less of an issue it is to not let them out til later. (Assuming you have feed and water in the coop - if one or both is outside, the hens prolly ought to go out as soon as daylight permits)
To give two examples - my tractor (for just 2-3 hens) has a 'house' part that is only 2.5' x 4', and has water but not food inside. I feel terrible about keeping 'em shut up in there if it's daylight out. They SURVIVE of course but they sure don't LIKE it. In contrast, my main pens have 15 sq ft per chicken indoors plus the run, and *there*, I can perfectly well leave the chickens inside all day if the weather is nasty or we're away for a week, and nobody seems to mind very much.
So it just depends on your situation. Also on your personal feelings and philosophy.
Good luck, have fun,
Pat