I would also prefer the buffs to be the default duration, for the same reason as ToxicGirl mentioned.
It will prob not matter too much now at first with the limited content, but I remember for Deungsan Peaks you needed to invest in your buff to be able to do the Deceitful Forest quests so that you can access Deungsan Peaks with her as well. And it was really rewarding and gave more depth, and you really felt the value and satisfaction it gave you, after spending resources to level and assemble equip for your buff.
While 10 minutes wouldn't be game-breaking, it would still be way more possible to just keep the buff on 54 forever, and porting back to Map1 to get the buffs.