There's this old saying: "The bee is praised, but the mosquito is swatted." The gist is, they're both very busy, but the bee is making honey while the mosquito is just flying around being a dick. Or something like that.
It's about productivity. Being busy isn't necessarily being productive, and that goes double when you're in the gym.
Try this:
Here's what that would look like:
Want to really make this work? Adopt this rule and stick to it:
"When my time runs out, I have to stop right where I'm at and leave the gym, even mid-set."
We love to train, and cutting a planned workout short is a punishment. Chances are it'll only happen once. You'll figure out fast where the "junk minutes" of your workout are found and chop them out next time.