Water cooled / air cooled 2.2kw spindle

[EddyCurrent]

. . . but from what I have been reading they need to be run for so long at such a speed and then such a speed and so on.

I think you are referring to the bearings here. The Elte spindle I use has a start up sequence like that but it doesn't last for long and only has to be run at the start of each day. I have a small piece of gcode that runs it through the speed changes at the required intervals so I run it while getting the stove fired up. It's air cooled but I've had it running for hours at a time and it stays pretty cool, it helps that it's industrial quality. It also matters what speed you intend to run the spindle, if it's just slow rpm then you probably don't need the startup sequence but if you intend to run at 20k rpm or higher then I think it's a good thing and cheaper than changing bearings.