Redmine

The logged time entries are always stored as a fractional hours (i.e. the format you also get from the API). The 45 minutes in your example are thus stored as 0.75 hours in the database and returned as such to API requests. The returned data is as precise as possible given the underlying data format in the database.

If you want to convert the returned value to hours / minutes on your client (e.g. when showing the data somewhere), you need to multiply the fractional part of the number by 60 yourself.