Formal — to staff
Ryokan · Accommodation
You
大浴場（貸切風呂）の利用時間は何時までですか？
だいよくじょう（かしきりぶろ）のりようじかんはなんじまでですか？
Until what time can I use the large public bath (private rental bath)?
Romaji: Daiyokujō (kashikiri-buro) no riyō jikan wa nanji made desu ka? / Reply Romaji: Daiyokujō wa yoru jūichiji made, kashikiri-buro wa aite ireba itsudemo go-riyō itadakemasu.
Reply
大浴場は夜11時まで、貸切風呂は空いていればいつでもご利用いただけます。
だいよくじょうはよるじゅういちじまで、かしきりぶろはあいていればいつでもごりよういただけます。
The large public bath is until 11 PM, and the private rental bath can be used anytime if it's available.
Gesture & etiquette
None specific. A polite demeanor is appropriate.
Public baths often have specific hours, and some may have different times for men and women, or require prior reservation for private baths. Always confirm the details upon check-in.