Get both a music and a dance buff.

If you wanna bring along an "extra" or "stored" dance buff, watch the dancer again, even though u already got a dancebuff.

After like 6 minutes, tell the dancer to STOP dancing

don't do anything then.

Once your first dancerbuff runs out, just write /stopwatch in chat.

And woila... you get a new 2-hour dancerbuff instantly. You can only store 1 buff. so decide weather you need dance or music the most.