Duration
Duration is a fieldtype that allows you to store lengths of time.
{{ entry.duration }}
Parameters
Format
Similar to Date Variable Formatting, you can customize how you display the duration using a format= parameter. For example, 2:15:12 (8112 seconds) could also be displayed with:
{{ entry.duration.parameters({format: '%h hrs, %m min'}) }}
info
See the ExpressionEngine Documentation for more information on the Duration fieldtype