Being a simple man i need a simple spreadsheet to add hours to predict a finish time and date. I want to be able to add 36 hours to 15:00 Monday and the spreadsheet tell me the finish is 03:00 Wednesday. I am not bothered about the date so don't want the hassle of having to type them in everytime. Seems simple but I can find anything suitable, any one got any suggestions?

Thanks in anticipation
Martin