If I create an calendar entry in my mail database from 8.00 to 10.00, this calendar entry is spanned among time slots from 8.00 till 10.00.
I copy this entry to my custom calendar view (with all the fields off course), and here it is a thin line (time duration is not displayed in view, however entry starts at correct hour - 8.00).
My calendar view has time slots enabled.
What am I missing?
Subject: Does your second column contain a duration?
Your second column needs to calculate a duration in minutes - for an entry from 8:00 to 10:00 the resulting value is 120, of course. Standard calendar entries from the mail template don’t store duration in an item; it’s calculated in the $Calendar view instead with a formula similar to this:
(EndDateTime - StartDateTime) / 60
Subject: RE: Does your second column contain a duration?
Jerry,
so simple 
But you’ve saved me a lot of time !!! Thx, it’s fixed now.
Juraj