The convenience worth buying depends on which part of your day it actually returns.

Paying to skip a task is neither wise nor wasteful in itself. What matters is which part of the day comes back to you and what state you are in when it does. An hour returned at nine in the evening, when you are finished anyway, is worth less than twenty minutes returned where everything is tightest.

Before the next purchase of this kind, name the exact stretch it frees and what will actually occupy it. If the honest answer is nothing in particular, that is useful to know. If the answer is a bedtime story or a walk, buy it without guilt.