Hello ypma,
Thank you very much, I just modified a bit the function you made.
Me.txtbxMinutes = Format([txtbxMinutes] \ 60, "00") & ":" & Format([txtbxMinutes] Mod 60, "00") & ":00"
What I do is just type the number in the Me.txtbxMinutes for example 63, it will then be formatted to 01:03:00...