Sauna Time

Sauna Time is a quest given to you by a Soldier in Fire Emblem: Three Houses. This is a dlc quest available after the 1.3 update and unlocks the Sauna feature when completed.

Requirements
"Attention! Garreg Mach's sauna now open to all!"

"Check out the sauna, located between the training ground and your personal quarters. Talk to the sauna boss to access it."

Quest-Giver Dialogue
"Professor, have you really never visited the sauna? It's popular with the students, the knights...everyone, really! It's the perfect place to relax and wash your worries away. Give it a try!"

Completion Dialogue
"You have my gratitude. The greenhouse is an invaluable resource. If we cultivate more plants, I'm sure we'll be able to cook a larger variety of meals."

Location
Given to you by a Grappler near the sauna, a building between Byleth's personal quarters and the training grounds of the Officers Academy.

Rewards

 * Poultry x3
 * Wild Game x3
 * 700 Renown

Strategy
Talk to a Grappler near the sauna, a building inaccessible until the 1.3 update. Speak to the Sauna Boss and there will be a tutorial about how the sauna works. Pick a character from your roster to join you.