Hello!
My mother has a spinal cord implant (for pain control) so here is her experience:
She kept it on all day and turned it off at night (her normal routine). As for rides, that's really dependant on your injury/pain/tolerance. The rides didn't increase or decrease the stimulator. She couldn't do a ride like the Animal Safari because it is bumpy and jerky due to her back, not due to the stimultor.