Thanks! You have a calibrated eye, yes, they are 50mm – 60mm tall! So 50 – 60 feet at 1/300 scale. I honestly cannot remember how long each took, I think it was about 3 1/2 hours for each. Working from home helped, I would just keep restarting the print when I walked past the printer. I kept printing until I had a box full.
I think I will keep doing them and painting them up in batches of a dozen at a time. I tried printing several at once, but a print failure left me with a ball of plastic, so now I do them one at a time. If it fails, I have only lost one.