Don't know how big calf is but until you have a lot of experience, put 2 calves together, if you just feed one for show, any thing in the pen will make him eat to keep it from the other, on Sunday I only feed once, an empty belly will cause a more aggressive bunk attitude, and keep in mind that 3 percent of body weight is about the max for intake,
The 20 minute deal will work but around here they chug it down in about 1/2 that.