Quote Originally Posted by Gastronomie View Post
If I recall correctly, the XP it takes to get to Bond Level 5 is like, 5% or something (maybe even less? I forgot) of the XP it takes to get to Bond Level 10. It will take months. The first 5-star I pulled got to Bond Level 10 about 4 months after her summoning. But you will eventually get there.
I can confirm the bond levels are unlocked. I have Altera at bond level 6. It was a nice surprise that you get 3 Saint Quartz just for reaching bond 6. It's just an absurdly massive gap between 5 and 6. The daily quests give pretty good XP though (especially highest level experience farming). Currently, I'm keeping a couple main people together (my primary party is Altera+Prototype Cu Chulain, with a Vlad III as the reserve member if someone dies), and then tagging in the last two slots to different servants to get them to bond 1-3 so that I can do their first interlude quests.