Pivot Table - Sum of Time

Pivot Table - Sum of Time

I have a table w/ following structure;
"Daily time log"
Start   | End    | Category    | Duration
10:00    11:00    Project 1      (end-start) = 1:00
11:00    12:00      Project 2      (end-start) = 1:00
13:00     14:00    Project 1      (end-start) = 1: 00

Now, when I attempt to create a pivot table, it was not possible to create "SUM" of duration.
"category" as row - categorize
"duration" as data - SUM of duration

Zoho sheet identifies duration value as "text" hence "SUM" is not possible.

what did i do wrong?



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