welcome to srp

the idea is that you should be able to maintain you razor sharp yourself. that's much easier than getting it there in the first place. of course if the edge is damaged it will need to go back to the coarse hones and it's a big job again.
there are many factors on how often the edge needs a touch up, but initially perhaps every 2-3 months, and as you get better at shaving and stropping you could probably go for a 6 months or a year.