You can view the number of hours they have in their account by going to your my clients section. It will then display the number of hours they currently have in their account and it states their monthly bill day.
We will be adding specifically the number of hours they purchase to the clients page shortly for you to view.
In the meantime, to get a better understanding of the hours that go into their account each month, you can check on the day of their billing and then the number of hours they have in their account will be the amount they have purchased on the day.