Is it possible to raid on P99 without being unemployed?

[Izmael]

You can level to 60 without giving up very much. It just will be very slow. Find a mob you can kill solo at a safe-ish spot and kill it whenever you get a minute. Find new spot when the mob no longer gives exp.

It will take months or years, depending on many factors, but you'll get 60 eventually.

Raiding is another beast, though. It's very hard to impossible to raid if you have a lot of work/family/social commitments.

One way is to join a guild that raids during your nights. Then you can wake up for a couple hours for select raids you want to join, then optionally go back to bed when it's over.
I've done that for several weeks a few years ago because I wanted some VP stuff and it's very tiresome. I wouldn't recommend doing this on a constant basis.