Experiences differ I suppose. In my games, often at least half the party is all "looking around the room" and I have them all roll checks, using the highest (in general). If multiple things could be found, the next highest roll is used, etc.
I've found it works well for me, while sometimes keep the high DCs not found, but sometimes also found.
Well, what are the others doing while the first is investigating? I just run it they are all investigation different areas at different times...
And if they can afford to take 10 times the amount of time, why not? Otherwise, yes, time crunch and wandering monsters could be a concern. IMO, 10 times shouldn't be auto-success anyway--personally, I never use it.
Well, I suppose this just depends on the adventure and game style. For example, in a room I might have a statue, a chest, a bookcase, and a section of wall that it seems should hold a secret passage maybe. Each PC will pick an area to check and roll, then move to the next, etc. in the narrative. Now, to make the rolling easier, I just have them all roll for each thing at the same time, knowing in the game they are actually shifting positions each time.