I've got a maintenance forecast that incorporates SLL items that I put on an Excel spreadsheet, I just put in the daily totals and it updates itself, I don't know anything about Excel either, but I haveit in hours and minute not decimal time, I have a problem I cant solve about times above 9999:59 hours, and I haven't managed coloured warnings yet either. Actually for something like this it isn't very difficult.
What aircraft is it that you want it for?