Both you and Marvin are correct to point this out.
The time taken with VAR checks never correlates with the amount of additional time added on as far as I've been able to see this past year or so, whether watching us live in the Premier League and cup competitions or watching other teams/games on tv.
And as for timewasting at goal kicks etc, well yesterday's effort from the 'Palace canary' as you call him was straight out of the 'Tim Howard Masterclass on Timewasting Manual'.. towards the end of the first half I observed the stadium clock when the ball went out for a goal kick to Palace. From the moment the ball crossed the line to it being hoofed back in play, it took 41 seconds. I'm not sure how many goal kicks they had in total but let's say there were 15. At that rate, we spectators lose 615 seconds of play, equivalent to more than 10 minutes/10% of playing time.
And the referees are letting teams get away with this time and time again. As I said elsewhere earlier, the f**kwit we had refereeing yesterday did nothing but give the occasional 'Paddington hard stare' to show the Palace 'keeper who was in charge.
The sooner they start booking players for time wasting and the sooner they show on the screens the clock being stopped for any delays in the game (especially including VAR checks that are underway) the better..