Adding my 2 cents, I would also prefer to see the slicer time if it is available. At least for all my machines that I use RRF/PanelDue on, the slicer time is and has always been more accurate than the others provided. I've never seen it off more than the warm-up time.

@phaedrux I don't think so... I use Slic3r PE with my Rockstock Max.. The time estimates inserted by M73 are the same ones as shown in Slic3r itself. The time estimate as given by Slic3r is always spot on for me within 5 seconds and always has been.

Any chance of supporting the M73 command that Slic3r PE can insert into the GCode file? At 1 minute intervals in the GCode it inserts something like "M73 P25 R35" P being the percentage done, and R being the minutes remaining.

If it is enabled, the very first command in the GCode is a M73 with the full remaining time of the file.