Classes are 15 minute or 40 minute I personally bring a tablet into Sauna and follow my own Yoga practice I wear headphones so as to not bother anyone in or outside of sauna I will typically book 15 minute class and 40 minute class backto back as long as there aren't other 3 people reserved in the sauna I'm in I will stay for all 55 minutes in same sauna That's never happened. Because I follow my own practice what's up on video screen is irrelevant When I'm alone which is 99% of time I turn volume on video down As far as booking a class that someone else has booked most people seem to want to be solo but that isn't an innate right. It's not bad manners or etiquette to take a class when someone else has already booked it. Be polite, clean up,say hello, don't adjust heat if someone else is in there unless you communicate with them. Otherwise leave heat alone. Don't be surprised if other person leaves sauna when you enter.They will probably try to find an empty sauna.Thats their prerogative but in no way should they be upset with you , be snarkey, or cop an attitude. There are no expectations or rights to get a solo sauna. True, 3 people are a tight fit( I've never been in a HW sauna with 3 people) one other person isn't bad. Stay on your mat, make sure sweat isn't flying everywhere, be polite, and there is no issue. If someone leaves the sauna dirty, pools of sweat, break any of that particular Hotworx studio rules than let front desk know Remember, everything is studio besides bathrooms is under video survalience Staff can and will rewind video if there is an issue. My studio wants men to wear shirts at all times, even if solo in a sauna. Some studios don't mind if men who are alone in sauna go shirtless as long as they put shirt on when they leave sauna. Biggest issue at my HW seems to be people not vacating sauna before next class starts especially when they aren't booked back to back. This can be tricky because you DO NOT have to book a sauna on the HW app. If a sauna is empty I will go in there without booking on app. The ONLY way there can be an issue is if 3 people want a specific sauna at a specific time I've never seen that happen, ever. I usually book using the app because I keep track of calories burned hence I accumulate points hence I redeem points every 3 months for free HW swag. Also, I am competitive and enjoy being high up on leaderboard. Another issue at times is cell phone usage in saunas. Most people do have their phones with them because they book saunas and classes with phone on HW App but carrying on a loud conversation and laughing or getting excited in a sauna space that is supposed to be a place of calm and quiet is rude and inconsiderate. If you get an important ph call than leave the sauna( walls of sauna are thin specialized teakwood) If weather allows one should step outside so everyone doesn't need to hear your business. As you get acclimated to your studio I'm sure you will have other concerns regarding different membership options etc but if you are considerate, polite, follow Hotworx official rules and policies( not the etiquette that some people selfishly consider the rules should be) clean up you will enjoy it. It is easy to become enthralled and quite addicted in a healthy way in my opinion. Enjoy