If you stay at range guide the Whole time ranging you will most likely get banned
take 20minutes to go around rs and do other things, then go back there and train range again. If you go constant say bye bye to your account.
I used it to get 40-85 range about 2 months ago.
Then i saw this post about a kid who had 3 RS accounts banned from going there, so i wouldnt suggest it.
They don't seem to be banning a ton now so it should be pretty safe. I would still only bot 10 hours a day and try to talk if some one talks directly to you. Best to be safe.