I feel like this is do-able but I can't think of how to do it. Production schedule. User enters a date and a start time - dates will be Mon-Friday only, and the start time must fall between 6am and 230pm (8 hours available each day). I need a formula, for the next stage of the process, knowing that each stage takes 19 hours to complete and can only be completed during working days/hours. For example - if I put today in and 130pm as my starting day/time, then my next stage, where I need the formula, should show Tuesday, Jan 17th, and a start time of 830am, because I had one hour today of work, 8 tomorrow, 8 more on Monday, and then 2 hours Tuesday morning. Hope that makes sense and someone can clear my brain fog - thank you in advance.