Re: Infinity Time Chest Rewards
I hesitate to attach any sort of percentages or time estimates to the drop rates in GW2 because the RNG responsible for the awards has shown little, if any consistency at all, in drop rates from one player to another based on my reading of various posts online and conversations with actual other players in game.
I've always considered myself to have been lucky with the drop rates, in Infinity Time and elsewhere in the game, but I've known people with absolutely terrible luck. When I first started playing I befriended a player who had quite a bit more time than I had invested in the game at the time and while I experienced regular drops of the Legendary character pieces my friend was repeatedly "ignored" by the random system to the point where they ultimately gave up the game in frustration.