Time format for duration

Hello Ninox Guru's,

As a beginner I want to enter the duration of a piece of music in a database: 0:30:27 (30 minutes and 27 seconds).
You will have to calculate later because the times of different records have to be added up. What kind of field and format should I use in a record and how do I add up the different times later?

Thank you in advance
Rob