Sorry for the late reply- the version we're using is Cura 21.03 (for Lulzbot mini). Here is a link to the model we were using: http://www.thingiverse.com/thing:213860
That is strange. I tried it with Cura 15.x and got logical results: 5min for 30mm/s and 11mins for 10mm/s
Unless the 'Cool -> Minimum Layer' time is set to something really large (or small), I can't explain it other than there is something wrong with Lulzbot's version of Cura.
What version on Cura?
Can you post an image of the model you're printing?
Things like acceleration, jerk speeds as well as minimum layer times can affect the time to print a model - as well as it's size.
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