Just of note, Summer will be followed by a week of Hunting Quests. Note that these will give a 30% bond bonus to summer servants! The highest rank of the hunting quests grants 1,318 bond per run, so that's 1,713 bond per run before bond gain CEs.

The hunting quests will be

>Bones (Saber enemies, best node will be 1/1/1)
>Shells (Rider enemies, 1/1/3)
>Roots and Bells (Caster enemies, 2/2/1)
>Needles and Eggs (Lancer enemies, 1/1/2)
>Stakes and Claws (Archer enemies, 1/2/1)
>Swords and Dust (Assassin enemies, 2/1/1)