As noted in the Machine Operating Checklist:
https://my.carbide3d.com/faq/machine-operating-checklist/
Never leave the machine running unattended/unsupervised.
If a cut is taking a long while, look into why — adjust the tool used, the toolpaths, feeds, speeds, &c. The feeds and speeds in Carbide Create are quite conservative, see:
See
for concepts on this and see the series #MaterialMonday:
for specifics and also see: