Do it again, if it cycles longer the first time you have a clogged line in the coolant system. That means you will need to call a tech for the repair. The following questions are the ones that you should ask before accepting an agreement for an appliance
Do you have a license to recover freon?
(They must be licensed its federal law) That way they just cannot come out without you knowing and charge you then leave because they do not have one.
What is the minimum you charge for a sealed system blockage repair?
Please and lastly ask them to bring the tools needed to repair a blockage. They may find the part of your unit that is clogged and be able to repair it that day, that could save a second trip charge.
This will give you some idea if you want to repair it or not.
If it does not cycle longer the first time after you have left it unplugged for 30 minutes replace the parts on the side of the compressor. Do not order those parts online you will end up with a kit and it will not be a simple replace the part job. Find those locally, be sure to take a picture of how its wired. Take several.
Here is what the difference is. If your compressor has a clog what will happen when you unplug it for 30 minutes is the built up pressure will equalize. This will allow the compressor to run longer the first time because it has to build that pressure. Then everytime after that the cycles will be short because the pressure is there and does not allow the compressor to run long.
If the parts that start the compressor on the side are defective the compressor will not run long that first time, all the cycles will be about equal from the start to the next cycle. Pressure will not affect that part.
Please ask if you have questions,