Let's do an estimate. If you take on average 45sec to solve a puzzle, and your games usually last < 50 moves. You should reach your 45 * 50 = 2500sec / 60 = 42 min. So if you play > 42 min games and chess.com's tactics scoring is good, then you should get your tactics score. Assuming you don't get tired doing 50 tactics back-to-back.
Is there any correlation between them? My tactics rating is 1360. What would that approximately equal for a rapid rating?