I'm using the CEILING formula to calculate the duration between start/end times (round up to each 6 minute increments), in the form of a decimal number. Example, 6:00 to 6:30 is 0.5 hour (=CEILING ((B2-A2)*24, 6/60). For some reason, each 6th minute mark is counted UP, so instead of getting "0.5" I'm getting "0.6"
Solved by V. U. in 12 mins