If you can't race, I'd take 'em as far as I could. 10 mile first toss and keep 'em there for 10/15 chucks then put em further in 25 mile stages. I'd stop when I get them down to about 33% of what I started with. If we get the summer weather we had last year you may only get them 50 mile lol. If all was well I'd have 'em to the coast 120 / 150 mile.
Late breds can wait till the warm summer weather though.