Google Sheets Daily Activity log

I want to make a daily time tracker that i can use each day to enter my tasks as i do them and have it calculate the time. For the columns, i would want: start and end time(maybe from a time picker drop down), category(dropdown picklist), Activity/Diagnosis (text field), Solution (text field) and the last 2 columns would be activity interval hours/minutes, and total daily hours/minutes that would be calculated from the start and end time from the first columns. I am going to just copy a separate spread sheet for me, and 2 of my employees on a shared google drive so i can view them. So it needs to work on google sheets. Attached is a photo of what im thinking. It is not a mobile app, Just a google sheet.