The highest amount of moves by the losing side in a zugzwang In zugzwang, the usual idea is to limit the number of moves that the opponent can make. But they can also have many moves in certain scenarios.
What is the highest amount number of moves by the losing side in a zugzwang position, with and without promoted pieces allowed?
The following are full-point zugzwangs, so both sides are losing if either moved!

[Title "Noam Elkies. EG 128, Apr 1998, p.53, 10967 (v)"]
[StartFlipped "0"]
[fen "8/8/k7/8/K7/RNbn4/B7/1R6 w - - 0 1"]

1. Rc1 Nb2#


White: 8 with wRb1, 6 with N = 14. Black: 11 with B, 8 with N, 3 with K = 22. Total-36.

[Title "Noam Elkies. EG 128, Apr 1998, p.53, 10967 (text, v)"]
[StartFlipped "0"]
[fen "8/8/8/k1n5/8/K7/RRb5/QBb1n3 w - - 0 1"]

1. Bxc2 Nxc2#


White: 1 with B = 1. Black: 9 with Bc2, 6 with Bc1, 8 with Nc5, 3 with Ne1, 1 with K = 27. Total-28.