"It breaks my concentration. That makes things take more time. That makes things cost you more money." edit: Suggest that he ask you if you're busy over skype.

"It breaks my concentration. That makes things take more time. That makes things cost you more money." edit: Suggest that he ask you if you're busy over skype. Talking face to face is more effective, and I'd hate to try to discuss something over it, but interrupting flow really sucks.