Guess it really depends on what you mean by "do at one time". You mean start to finish? Or all at one time? I'll often turn several blanks one night, a few the next, etc. or do up a whole bunch on a weekend. Once I get a bunch up, I'll seal them all one night, prime another, then paint a final night. Less clean up and wasting of materials that way. Like right now I have around 50 waiting to be primed. If I am just playing around with a new idea, I'll do up a few and try different weighing, hooks, etc. until I get the action down right. Once that is good, I'll paint a couple up and see what the fish thing. If they like, I'll do a bunch more. So, to answer your question, between 1 and 50
Jigman