there is no standards for all shops and girls to strictly follow, it varies some slight different among shops and girls.
don't need to be so particular with the girls and shops, just follow the flow, mostly are ok, they are not there to con you, but very few might be bad b, too bad can't be help it is just your luck and dun make a fuss.
just know the basic will be fine,
https://tobita-shinchi.love/en/?Frequently+asked+questions
go there just to have some fun, don't go too details with them, just relax.
30 or 20 min is up to individual, if you are a quick one then 20min because once you cum consider finish.
if you want to spend more time and take your own sweet time then 30min.(10min as tipping to the girl, if u can afford)
far as i know, base on the culture of tobita, japanese will sit down and do a short chat with the girl, before starting.
this is to 'get to know each other', after that, the sex is willingly from 2 'known' party.(formality).
i usually after sex then will chat and want to know her, sex was done truly from love at first sight , from the heart.
i actually overhead them laughing next door(i was already naked) when we went in almost the same time(i was like few minute late, as i saw the guy went up and i took the other girl).
But if you cant speak japanese, then can stop the crap and the girl will just ask you to strip and lay on the bed.
the girls mostly will ask you to sit by the table, either will pass you a face towel and ask you for a drink.(by the way, dun finish all the tidbits there, it is not really mean to do it, have some meal before going there)
i usually start to strip automatic once i am inside, sometimes the girl just laugh.
like i say, follow the girl instructions if you not sure, the girls will guide.
follow the flow.