Rp'ing question just because I'm curious =)
I’ve never had problems getting into a dungeon because of my gear. Just don’t join groups that are explicitly looking for optimized dungeon running, since those aren’t the type of players you, personally, want to go with anyway.
I’m super chatty in dungeons and don’t always make a real effort to equip smartly, and it’s never been a problem.
As for sleeping, fast traveling, or whatever else, that really depends on the people you’re RPing with. I’m more of a “pick up and play” kind of roleplayer, so I’ve never seen anyone with actual rules in the game. I’m sure there are more dedicated guilds who might do that, though.
Generally I’ve found that time passing ingame is taken more loosely in MMOs than you would in a survival-modded single player game – it’s a more social kind of roleplaying, built around interactions and stories with other characters. And doing that requires a lot of typing :P which takes time – so you’re more likely to go by real-life time than IG time, which IIRC has 2-hour cycles? barely enough to RP an outing, let alone an entire day of activity.
And as Redenaz said, a lot of things depend on who you RP with. Some people aren’t fond of waypointing, or want to have an actual in-game excuse/reason to use them before they will – others will decide that since they exist ingame they’re okay to use.
Since you can’t really mod the game for survival or stuff like that, it’s really up to the players to decide what is or isn’t possible or reasonable. So up to you to make the effort to change your outfit to something that looks like it can keep warm if you’re running around the Shiverpeaks as a squishy human for example, or to try and ditch the heavy armor and weapons as much as possible for formal events or hanging around in a tavern. Or not. Same for injuries – you’re technically immortal as a game character, but some people will set rules like “if I get downed my character will have an important injury” or stuff like that, or may decide to get injured for plot/story reasons. Same for death.
I don’t think I’ve ever known people to go through the whole eat/sleep/drink in MMOs, as it’d get very tedious (you don’t get time skips when you sleep, unlike you would in Skyrim for example) but they probably exist. I have seen people use “I need to go to bed/eat dinner” or something like that as in-character reasons to leave when they had to logout however, so as not to just disappear into thin air in the middle of a discussion.
For stuff like dungeons, depends too. I’ve run dungeons in-character, as a guild group going adventuring, where people ran whatever builds and tend to favor whatever is good for the character itself, but it can also be OK to separate in-character activities and stuff you do for money/dailies/whatever, and therefore switch gear/build between those two modes.
I used to RP, but the RP guild I was in only had a few rules.
We couldn’t waypoint but could use portals.
And if we died, we would have to start back in the Personal Home.
And my play-style never really interfered with my RP persona, so dungeoning was never a problem.
Heh, I was an orphaned thief who’s parents was killed by my mentor who raised me, when I found that out, I vowed vengeance and to steal and murder my mentor with his most prized possession, Zap. Haha, it was a blast till I finally got Zap and killed his sorry kitten then I kinda got out of RP’n. I remember I would go into dungeons with my persona and rant on and on about my mentor and when the two of use were forced to party, I would always try to get him killed via mobs or some other way. Was a blast now that I think about it.