I have a column of time spans. For example

8:45:06

12:35:45

etc

I’d like to determine the average time span. Like, what is the average amount of hours I spent doing X each day. Not what average time I started X (although I have that data) but time spent.

=AVERAGE(A1:A2) gives 0.

=AVERAGE(A1:A2)/24 gives #DIV/0! (read here about how spreadsheets see time as % of days vs hours)

=SUM((A1:A2)/2 gives 0 (this is the formula used for the other columns that are just numbers)

Numbers are formated as time 00:00:00 without the PM because it isn’t a clock time but an amount of time.

Surely I don’t have to do /24 for each entry. That would be time consuming. And I’d have to do another average listing.