Derek Cole explains that an AC running long is actually more efficient than frequent short cycles, as long as the unit is properly sized. A system that runs continuously to reach its set temperature and then shuts off uses less energy than one that keeps cycling on and off.
You don't want it to stop running. I mean, think about when it's 98, 100 degrees outside. Think about getting in your car and then driving to the store. How many times did you turn off the AC? Probably not ever. Your home's the same way. It's trying to keep that same temperature all throughout the day. So it's not going to stop running if it's on a set point it's trying to reach. Now, if it reaches that set point, then obviously it's going to turn off. But the unit running for a long period of time is not necessarily a bad thing. If the unit is sized— to go back to the first question— if it's sized properly, it is running— it is better for it to run longer because it's more efficient than turning on, turning off, turning on, turn off.
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