Wait, you came from the other topic on openings and now suddenly put a "tactics" thought on this thread? (And next, possibly a new thread on endgames, right?)
You could do this on a "once-a-week" basis if you wish to attempt one, perhaps in the form of 5-minute puzzle rushes, but do not wish to make speed chess something very regular.
title
i am 2750 puzzles and have not ever really done speed puzzles and i want to know from others when is a good time to start?