I haven’t had this happen before. I go to print a plate on my X1C and no time is given in summary, and no time estimate for completion given while printing. The other plates in my file give times after selecting ‘slice’ It doesn’t stop me from printing, but …
Any explanations?
Can you provide the .3mf or gcode.3mf file? this is happening with?
Its giving you an warning about mixing filament, I wonder if you fix the issue and reslice ?
It does seem to be an issue stemming from using PTEG as support interface.
Have you done the last one on the list in preferences
Looks like an issue with the purge calculation. Unfortunately, setting purge volumes to 0 doesn’t have any effect on the calculation … not even volume … 
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