[tbrownaw]

It's delayed because one of the big dependencies is delayed, and there's not much to be done until it's ready.

[jaawn]

Then, depending on structure, people could assist on the delayed dependency, or devote time to a lower-priority project until they are able to work on the more important one.

If neither of these are possible, then it probably is okay for that employee to work shorter days in the meantime, and leadership resources should spend time solving the bottle neck issues to prevent the situation in the future.