I'm sure some of the other members will chime in here but...

The number of shaves in between touch-ups really varies person to person and razor to razor. Some growth is thicker and tougher then others. Different steels hold different edges for different amount of times. I believe there was a survey a some time ago polling the times between touch ups, see if you can find that and you will have an idea what the "average" time is.

On a side note, for a newbie I would expect that you will have to touch up the razor more often. This was the case with me, poor stropping is the core culprit, the better my stropping got the longer the time between touch ups. I used to have to touch up every week for the first couple of weeks. The more I got better at stropping the longer between touch ups, I can go about 15-20 shaves about every month and a half to 2 months. Once I feel the whiskers on my upper lip pull I go back to my Norton and give it 10 laps.

Don't get disheartened, you will get to were you want to be. When I was learning to strop I would use a test razor and try to get a consistent sound from the razor. When it sounded good I started to get a feel for it. After I got the feel, I didn't have to listen, my hand would feel and react with out thinking.

Hope this helps,

John