You can give as frequently and as much as you'd like. B1G1 does not place any mandatory requirements on your giving activities.
We understand that different businesses have different needs and sales cycles. We also believe that giving should come from a place of 'Joy', rather than obligation. We want you and all our business members to give when you're happy to give.
That being said, we do encourage you to create a giving habit in your business so that giving happens without you even needing to think about it. For example, when I make a successful sale, I give to project X. When I send an email, I give to project Y.
Simply log-in to your giving account at the end of the day or month (or whenever best suits the needs of your business), look back at the impacts you want to create as a result of the great things happening in your business, and process your giving online. (Share the joy of your giving as well with the other widgets and tools provided!)