Clearly it depends on the strength of the machine, but on mine I would probably do that in 1 or 2 passes, not 9. So long as the centre of the tool is offset from the edge of the material, and you are only cutting on one side, the force on the tool will not be too great. As a starting point I would set the spindle speed assuming that the tool is the maximum diameter it cuts at, as that will be a minimum speed so should guarantee nothing is broken or burnt. You can then work up from there if the material removal rate does not initially meet your requirements.