Pretty much every sex education textbook in the 1970s and 80s said that
masturbation was fine as long as you didn't do it "too much." I am
sure this led to millions of people desperately trying to figure out how much
was "too much," never getting an answer.
The reality is that there is no number I can give you. For some, once a day
might be "too much," while for others, ten times a day is fine.
Whether you are with a partner or not has no bearing. What it all comes down
to is context.
It is not about masturbation per se, it is about why you are doing it. If you
are doing it as a way to give yourself pleasure, release stress, celebrate,
or any number of healthy reasons, you can masturbate until the cows come home.
(What is it with me and the cow jokes this week?)
I do not subscribe to the notion of sexual addiction, but I do believe
in compulsive sexual behavior. What you need to ask yourself is are
you enjoying it when you masturbate, or are you doing it to avoid
something. If you are able to eat, sleep, work, go out with friends, etc.,
then masturbate all you want. No need to worry or feel guilty. Enjoy!