Display print time after print is done

[EagleeyeKai]

Is there any chance to display the print time after the print is done. I tried using {printTime} in the field "Print done message". However, on the printer it is just shown "{printTime}".

[tpmullan]

Just the total time that the print took? Right now that information is not in the print complete function, but I can probably look it up from octoprint. If you want to submit a pull request I would be happy to merge it, otherwise it will take some time to look into.

[tpmullan]

I opened #54 with a fix for this. The print_done_message now supports {printTime} by formatting the elapsed print time from OctoPrint's completed-print event payload.