Ybs can be trained at 12 weeks old and get plenty short ones in as much as possible in my opinion....I normally got to 1 mile and just fire them out then I go to ten mile fore quite a few trainers One thing I stopped doing this year was giving them time to settle at the lib site...as soon as I stop the car they get put out.....started doing this after I read Ad sherlauchens does it Latebreds must be trained and If I had them any decent winter day I'd get them down the road, doesn't need to be too far