Welcome to the Horse Forum.
Many have said some great things.
I went and checked out the blood lines of both these horses both are good~the first has a bit better pedigree. But, pedigree is not everything.
Many OTTB's no mater the pedigree can turn out to make great horses for many diciplines.
Lots of things here I agree with. I agree with Kevin about not turning the horse out for a year. Maybe a short time or have the horse out to pasture 24/7 and worked with on a regular basis with a person experienced with OTTB's, because as someone else has aalready stated the "track training" is different and some things do need to be cahnged.
One thing to keep in mind is if these horses have not been out of training for long then they are pretty fit already and by turning them out for a year and not doing anything with them, that fitness is not going to be there anymore.
Years ago when I took OTTB's from the track, I got them started on a rountine quickly. This was of course if there was no injury involved in the reason for leaving the track. Depending on the horse I usually could them going in about 9 months to a year. Sometimes a bit longer to start them over cross rails. All were set with a good foundation of flat work and basic dressage before ever started on cross rails. Sometimes it can get tricky with the ground work and re-training if the horse is a bit older. It just depends on the horse.
By getting them into a regular work program with an experienced person this will help them to keep a good routine.
One thing I would want to know is complete history if you can get it. Don't forget that just because someone tells you something does not mean it is accurate or truthful Always get the PPE!
Some OTTBs do have some nasty habbits but many do not. I think to ask "how long" this process will take is a bit much. Reaosn I say this is I feel it is dependent on the horse and trainer.
This is a big investment. If your friend is looking for a horse to have undersaddle fairly quickly maybe she/he may want to find one that has already been started. If the person is partial to an OTTB there are many around she/he might find that are already to the point in their training, they will be ready for showing in the spring or summer.
I am sure that you will get lots of information here.
Hope that your friend figures it all out.