I ran it for 8 hours on Saturday and nobody had an issue when someone replied to me my question about wanting to clear for silvers. We often split up so we could quickly peek into rooms. The only time you might see parties hesitate (at least on my DC) is if we've gone through a couple rooms and there are still more and we don't have a pomander to reveal the map. That one random map room here and there on a big map we'll choose to ignore. But it's really not any time spent to just peek and run off if nothing is there. Even if something attacks because it's close to the door, can just drag it to the portal. Saying something is going to take twice the time is going to turn people off trying and make them resentful of those who do. But saying it's just a couple extra minutes and most are okay with it.
I don't agree with the minimum time but I think players who use POTD for the secondary intention of leveling instead of the original main intention of getting the exclusive rewards don't keep in mind those who want to do the content for those exclusive rewards. Now, I think this is something the devs need to fix. The best fix will probably be to increase the boost from a single chest and make every chest a guaranteed skill up. Then someone needing stat boosts could still gain progress on super speed runs and would gain significant progress when they can search out and acquire more. POTD (and HoH but let's be real, who really wants those) has been out long enough that there's little reason they can't make those weapons easier to acquire.