Experience with Rover cards?

So apparently, Rover cards are going to be a mandatory step in using the app here shortly (according to the Rover site) and from what I gather, they recommend sending them after each visit. If I am doing 3 visits a day would it be possible/ acceptable to only send one visit summary for all 3 visits? I just think that 3 rover cards a day is a bit much....I don't want to overload my clients inbox while they are on vacation......Thoughts?