The result is a ctmm model fit object that you want to store like
FIT <- rsf.fit(...)
and then do other things like summary(FIT) ... and soon RSF-KDEs.
I don't believe that I had it record the number of available points used, but I can add that. However, I have to warn that this is both data and model dependent. Models with more or less variability will require more or fewer available points, respectively.