In my experience the brushed motors used for that size either break quickly with crashes, or just stop to work within 4-6 hours (max!) of flight time. The brush

In my experience the brushed motors used for that size either break quickly with crashes, or just stop to work within 4-6 hours (max!) of flight time. The brushless motors are much more solid and less likely to fail. I have broken many of those too, but they last a lot longer.