Astner
The Ghost Who Walks
Originally posted by BloodRain
Timeframe makes it unquantifiable. Just look at how fast the galaxy is rotating.
Not really.
You can assume that the border rotates just under c relative to the center. If r is the radius of the galaxy the time passing, is t = |⦨|r/c, where ⦨ is the angle in radians.
We then have Broly's age as a limiting factor, as well as the timeframe given.
I'd dismiss the two weakest links. The rotation would be dismissed as artistic effect, and counting frames is never reliable as no movie or game or movie has a steady continuum of time.
So the most reliable answer would be Broly's age. You could probably restrict that to around a decade since he's as old as Goku, and Goku was 21 when Gohan was 3, meaning that he was 10 not counting the time he spent in the room of time and spirit.
Meaning that Broly should be 28 in the 8th movie, and since his powers blossomed in his late teens it's impossible that the destruction would've been caused earlier than that.
More impressive than Cell for sure, but at the same time Broly wasn't at the level of chō saiya jin 2 Gohan. So if you go by feats, then Broly, by scaling, chō saiya jin 2 Cell.