Largest I've done was 2000 shirts. 1 color sleeve, 1 color back, 3 color front. Printed it in 5 days. Probably around 90+ hours. Did it alone as well. Stacking, folding, printing, the whole shabang. I may have teared up a little upon finishing that one. I'm still printing manually. Gonna take the plunge and run my shop full time come September, hope to be automated by next summer