Thanks for the reply!

Level 1 to 80 in a single evening RaF boosting
How is this possible? Grinding in high level zones?

A > B > C (C is inactive, not used for now)
D > E > F

A has the LvL 90 DK. The others only have low level toons. ABC are on a different realm than DEF. So I think this is not possible is it? Because it needs to be like A (90 DK) is in a group with the linked Acc DEF on the same realm. Is there something I missed or didn't unterstood? Some other method to do this? Should I create on A a new DK 55 on the same realm like DEF and boost my toons to 55?