The Geo Hypostasis will respawn a few minutes after its death and can be completed as many times as required in a week.

How long does it take for Oceanid to Respawn?

Luckily, you can rinse these bosses as often as you like (provided you have enough Resin), because they respawn three minutes after you collect the spoils of defeating them, However, you have to travel somewhere else first — just teleport to a nearby Waypoint and slowly make your way back and you should be fine.

How much time does it take for Maguu kenki to Respawn?

When defeated, the player must consume 40 Original Resin to claim its drops, which consists of Artifacts and Character Ascension Material for various Characters. It takes 3 minutes for the Maguu Kenki to respawn.