You are correct when you state that it is a little on the low time.
It is also practically impossible to do it in 50 hours. The 50 hours has to consist of at least 35 hours PIC. Now you can't log PIC time until you are either (1) a private pilot or (2) flying solo. This essentially means that in 15 hours you would have to master hovering, autorotations and everything else. Quite why the 50 hours is given is beyond me.
What we normally do is to recommend folks to get the private add on first and then do the commercial add on after. Once you are a private pilot everything can be logged as PIC. Normally we see most folks doing it in around 70 - 80 hours. Still a little low to be doing commercial work!
Hope that helps a bit.