Hi Timo thanks for your reply! Believe me I've tried all the formatting options in Excel to get rid of the "min" label but no joy! Hope you like screenshots...
In Excel the format defaults to Custom and if you inspect a cell it is in the time format 00:00:00:

Which is using a custom format:

If you change the format to Number you get this:

General gets this:

If you change the custom format to remove the "min" it visually looks ok but it is of course still just minutes in a time format, not a number:

And then you can't sum on the cells, which is what I need to do. You can see these two cells look like straight numbers:

But a sum on them is of time:

For this example I need a total of 134, not 2 hrs 14 mins.
About the only thing I can find to do is export to CSV then use text-to-columns to remove the "min" from the Duration column. So my original request was whether there can be an additional export option so I can avoid having to do this.
Thanks!
Amy