Answer:
honestly i would say 5 seconds
Explanation:
7 and 6 seconds seems to be a little to long and 4 seconds seems to be short. also when holding your breath its seconds that you can hold it not minutes ( unless you somehow managed that :/ )
In my opinion, the best anime is My Hero Academia, it’s action packed, has inspirational moments, great quotes, and overall has a great way of showing who the characters are and sticking to what needs to be said rather than putting in a bunch of side episodes like other anime’s.