400 times a day?
24 thousand times in 2 months.
That's 16 times an hour.
4 times a minute.
Once every 15 seconds.
I wasn't assuming that Chakotay was playing with himself much more or less because he was marooned on a deserted planet, or that she was trapped on a deserted planet with Janeway.
It's just what men do when they are inside or outside a relationship or getting it regular from another person or people. A natural drive that will persist no matter the obstacle.
There wasn't a sexual vacuum on New Earth no matter the limts Janeway thought she was imposing.