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The cycle time estimates in Fusion (and all of our Autodesk CAM tools) are based on simple formulas that take into account cutting path distance and speeds and feeds. Depending on the machine, tool change time, rapid speeds, etc. the values can vary, but typically not by more than 10% (in my experience.)
Most of my own experiences have been on Haas, Fadal, and DMG machines; all very close to the estimated cycle times (<5% +/-).
The results you got are significantly off so we'll definitely take a look to make sure that nothing changed inside the software that could cause such a discrepency. Then we'll try to dig into your machine config and see what might be the cause of such a difference.
Thanks for posting.
Anthony Graves
Product Manager, CAM
Fusion