Time format in a "Duration" type field

[lineamovil]

Hello!

I have 2 field that I use to register a star time and end time. Then I get the time duration.

Both fields are "Duration" type, and the format is "HH:MM"
It works fine, but I would like to have the user input the data easyer. Right now they have to type 08:00. insted of just 800 and the format take it as 08:00

I have a default value of 0:0

Any ideas?

Thank you for your help...