Depends on the colt.
If he has been exposed to humans and halter broke I will stick him in a round pen and work him. He learns that being next to me. And paying attention is the best place to be. I also get him really soft in a halter during that.
At that point sacking out and saddling doesn't take long if I did it right. Then getting him used to weight in the stirrup on both sides, rubbing him with my foot on his butt, rubbing his neck and head with my hands. I don't sneak rides on colts! Causes for wrecks later and usually a lot worse than if you would of dealt with the issue in the beginning!
When ready, I mount and ride. I ride in a halter for the first couple of rides, when I switch directions, I flip the lead over his head. When I ask for a stop I wait until he wants to stop(training is about using a horses thoughts and actions to your advantage, good or bad) I quit riding, and attempt to bend to the stop. I start with leg(or lack of) and seat before the face even at that stage, they start to hunt the stop.
After a ride or so I let him pack the snaffle but still use the halter. When he is comfortable I introduce using the reins and ride him with the snaffle.
Usually by the fifth ride we are outside. Whether it be the arena or the pasture. Too much rounpen makes for sticky bored colts.
I DON'T LEAD 'EM AND FEED 'EM, I RIDE 'EM AND SLIDE 'EM.