**~1 to 4 minutes**
Apparently 1 to 4 minutes. And you don't get much benefit from supersetting the same muscle group. But supersetting exercises with no muscle overlap is effective.
I find this large range dissatisfying as an answer.
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# More
## Source
- [How To Train Like A Minimalist (More Gains In Less Time)](https://youtu.be/xc4OtzAnVMI)
## Related
- [[Ideal Exercise Regiment]]