According to the description and patch notes, DoT on Leg Breaker/Fly Swatter/Grounder are supposed to last 3 seconds with 8 dps/10 dps/23 dps respectively. Guess what, it’s not.
Leg Breaker 8 dps for 2 seconds
Fly Swatter 10 dps for 4 seconds
Grounder 23 dps for 1.5 second.
FYI, I am not talking about the jetpack reduction effect. Here is the test that I just did a few minutes ago.