Since the doubling of mob-kill-per-session .. no idea when this happened, it's a long time since I leveled an NPC from the start .. the Bond requirements for quests are now way too high.
For example, my NPC is 52, about to level to 53, with a Bond of 38. Even scaling back from non-optimal XP, ie. fighting mobs that are EP to me at 64, she's getting nearly a level per session.
So in about 3 or 4 sessions max she'll cap 55. The next Limit Break, Regaining Trust, according to the Wiki requires a Bond of 55, but my NPC at most will be 42-ish.
There is no way I can get Bond to 55 without wasting Signal and Tactics charges on simply summoning her to bump Bond, and talking to her at the Rendezvous Point every day.
The Bond requirements need to be halved to balance the doubling (more or less) of the XP-per-session that happened when the kill-per-session value was doubled.