You, as their sponsor, just need to explain them what are advantages not using all available VPs very quickly. To let them know they will not gain anything with do it in three days and then nothing. To show them for example, difference in earnings from being TL and then next month maybe no more than EA instead of regular progression to become EA with all VPs from daily, weekly and monthly actions and to make it again in second month.
Make just a few calculations in steps and probably, if they know why they joined the program, will understand what to do.
Basically, You can't do nothing stop them of use everything within even first 3 hours of joining.
You, as their sponsor, just need to explain them what are advantages not using all available VPs very quickly. To let them know they will not gain anything with do it in three days and then nothing. To show them for example, difference in earnings from being TL and then next month maybe no more than EA instead of regular progression to become EA with all VPs from daily, weekly and monthly actions and to make it again in second month.