Three tracks are listed as 3:45, 4:20 and 2:55. Adding them as if they were ordinary decimal numbers gives a neat-looking answer that does not describe their combined duration. The colon separates minutes from seconds; it is not a decimal point.
A small duration check can be useful when making a listening programme or recording details of a release. Start with a few tracks rather than an entire shelf.
Put the durations into one unit
In this invented example, 3:45 is 225 seconds, 4:20 is 260 seconds and 2:55 is 175 seconds. Together they make 660 seconds. Divide by 60 and the result is exactly 11 minutes, written 11:00.
You can also add the minute and second columns separately, then carry each group of 60 seconds into the minute column. The method matters less than keeping the units consistent. A calculator cannot correct a meaning you have not given the numbers.
Record where the times came from
Write whether you copied the durations from packaging, a player display or a listing for the release. Keep that information with the version you own. A displayed duration should not silently become an independently measured value in your notes.
If a stated album total differs from your sum, check the track list and transcription first. Then investigate what each source includes and how it presents duration. Do not change a number merely to force agreement with the total you expected.
Leave room in a listening plan
An 11-minute group of tracks does not necessarily fill an 11-minute gathering exactly. Introductions, discussion and the time between selections belong to the event plan too. Keep those allowances on separate lines so they do not become fictitious track lengths.
For a multi-disc set, combine this check with clear disc and track numbering. A useful entry might read, “Three selected tracks total 11:00 from the printed timings; allow additional time for conversation.” That is precise about the arithmetic and modest about what the source tells you.