it is NOT about 10 min 15 min or 30 minute video, but how long does it take to shoot and what the model must do on the video.
Most " solo" preformers will charge 2 to 300 dollars/ per 2h scene. Some cute amateurs, if they are smart, will want more because they are fresh, some overttattoed,silicone laced and Botox injected battleaxed Bimbos will ask for more but will stick baseball bats inside for a " Big Mac menu"
the word " amateur vs professional" is NOT in the equation.