> I don't think suggesting a 4 day work week due to an incomplete salary review is a good option. That suggests that you may have anticipated a 20% raise, which isn't all that realistic.

Came here to say this. Missing a 3-5% raise and cutting your work hours by 20% is a petty over-reaction, both practically and mathematically.

(Mathematically, that would be the even-money proposition if you expected a 25% raise.)