I cut red oak for about 4 hours before the drill started to burn. After 4 hours my calipers showed that 0.07mm of the cutting edge had been used. They're cheap bits for a reason.
Pros
Wide Compatibility: Genmitsu SR05A Double Groove Milling Cutters are compatible with most desktop CNC machines such as Genmitsu 3018 series as well as other industrial CNC machines. Just make sure you choose the right size collet for your device.