Compare similar conditions
Keep several days of approximate start and stop times, outdoor temperature, thermostat setting, and room temperature. Note whether you changed the thermostat schedule, filter, or fan setting around the same time as the windows.
Compare similar weather and thermostat settings when possible. A cool week after installation cannot establish how the windows changed performance during a hot week. Watch for uneven rooms, unwanted temperature swings, new noise, ice, or rising indoor humidity rather than treating every shorter run as a fault.
Keep normal owner settings steady while collecting the pattern. Do not close many vents or change blower speed to make the unit stay on longer.
Separate reduced demand from a fault
If the home reaches the setting, stays comfortable, and shows no other trouble, we would start with an operating review rather than a replacement recommendation. The contractor should still explain whether the pattern is appropriate for the actual system.
If cycles are very frequent, comfort is poor, or the compressor stops before the thermostat is satisfied, request a diagnostic visit. Ask the technician to check control operation and measured airflow, then assess sizing if the findings point that way.
The earlier system selection may have been based on the house before its improvements. If replacement or major changes are proposed, ask for a cooling-load calculation that includes the new windows and current home conditions. A load calculation estimates the cooling the house needs. It should support the recommendation instead of relying only on the old equipment's size.
There is no need to chase a magic number of minutes for every cycle. The next step is to share the before-and-after conditions and ask whether the current pattern is reasonable for this equipment, or whether a measured fault needs correction. That gives you an explanation tied to your home and a reason for any money you are asked to spend.