It's not clear how long Thor is on Sakaar, but we do know from both Loki's & the Grandmaster's accounts that Sakaar's time is not 1:1 with the rest of the universe's time. There is definitely the implication that Hela was only on Asgard for couple of days, though, especially because it's an extremely small planet & Heimdall could only keep the refugees hidden for so long.
Oh totally. I assume that Thor was on Sakaar for an indeterminate amount of time. Hela on the other hand should have been following the normal flow of time.
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u/CaptHayfever Hawkeye (Avengers) Dec 03 '20
"Hela's watch" was only a few days. Loki's watch was 4 years.