Help needed on time data types

Hi I am trying to setup a timesheet app. However I have come up against
an unexpected problem (possibly fatal)

I cannot seem to find a field type in postgres that is equivalent to
h:mm without enforcing a 24 hour day limit. This seems to preclude pg
from use - am I correct?

All the date-time types seem to only be for specific time dates and not
for a running total.

Any help appreciated.