Some people at my work do compressed hours, so they do 5 days in 4 and have Fridays off (so they work 8-6 rather than 9-5 or thereabouts).
There are A LOT of meetings in my job, but etiquette states these would usually be between 9:30-4:30. So in effect, people who work compressed days are getting out of a whole day of meetings, as they won't have meetings during their longer hours.
I've also found they log in and out to the minute of their hours, whereas those who work Monday - Friday generally login at 8:45 and log off at about 5:15. I really doubt they are 'full on' working that whole time to make up for a whole day off every week.
It's become a pain to me personally because my colleague has to offload lots of things to me because she doesn't work Fridays and she is now complaining about her workload as she has to compress all meetings into 4 days. I also have to attend her Friday meetings that require attendance as she can't go.
AIBU to think compressed hours are actually working less hours? Preparing to be flamed!
And I can't do compressed hours in my role but even if I could, I'm not sure I would do it.