Duration conversion issue (CVS)

Hi all,

I'm struggling with what I feel should be a simple issue!  I have a CSV file coming from some time tracking software I use.  The format is HH: MM: SS and represents the duration of a task. When imported into Power BI, it looks like this (format of the column is 'Time').  I then parse this and convert myself into a decimal for the purposes of charting:

As an aside, converting to Duration doesn't work and triggers the following error:

Anyway, all is well until I have a duration >24 hours.  Then it get's upset:

I've tried converting to Text but then it tries to convert it to an actual Time of Day and that's no good.  Any idea how I can handle this situation?

Thanks in advance!!