Once you have the total number of minutes, then divide by 60 (that will be the hours), then the reminder will be the number of minutes left. Then either use a select statement or nested if statements that will tell you how to round the minutes off (i.e. if remainder <= 7 then 0 additional time, else if remainder <= 22 then 1/4 additional hour, else if remainder <= 37 then additional time = 1/2 hour, else if remainder <= 52 then additional time = 3/4 hour else additional time = 1 hr
I am not a programmer so someone out there may have a better way, but that is all that I could think of.