I’m being pretty real here, time is really bullshit. You can hide in a corner and wait until the “kill someone for free” ability charges.
What I suggest is for time to simply require a charge bar. How it works is simple:
There is a bar overhead that stores time energy. Punching people gives energy. Energy is used to activate your abilities, and you can hold the ability button to use for a longer time. Depending on how much you have out of the 100% meter, you can have a longer time reverse OR a bigger time bubble + more add on hits.