Converting decimal time into Hours, Days and Minutes

I want to convert decimals in to hours, and minutes. However my returned value is giving me the following. I want to convert hours into days. This is my current expression.

=Floor(Fields!avg_proc_time.Value) 
& " hrs "
& floor((Fields!avg_proc_time.Value - Floor(Fields!avg_proc_time.Value)) * 60) 
& " mins  "

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