Automatic winding teste (1120 movement)

I recently (Dec 2025) had a Calibre 1120 watch serviced at an authorized Omega service center. The manual winding is excellent (48 hours, well above the minimum 44 hours), but the automatic winding seems poor (I often use it for almost 8 hours and it doesn't last all night without stopping).

Question for the experts: What is the best way to test the automatic winding before sending it again to Omega? I will buy a watch winder for testing.

Thanks!