Great to have you join the Community. I'd be happy to answer any questions you may have.
At this time, QuickBooks doesn't allow to enter/track hours or days seperately from the available funds. I recommend tracking this manually on your end. I know how important this feature is to you and I recommend sending feedback to our engineers by clicking the Help menu and looking for Send Feedback Online. New product ideas and improvements are largely based on the feedback we get from users like you. Let me know if you have further questions, I'll be happy to help.