If launching from Green River for Labyrinth, I'd personally try to have 6 plus days, fewer if you launch from a private facility (Ruby Ranch), but you can take as long as you'd like from what I recall. All flat water and at lower levels definitely some rowing involved, but not horrible. Haven't had bad winds, but certainly possible. At 30k on the downside of peak the bugs are horrible, my wife and I on single boat trip were going to spend 7 days, by day 3 we were rowing like hell! She ended up with over 120 countable bites, more counting groover time. Ouch!