It's do-able, but only if you have the right genetics, the weather cooperates, you are on a very good feed program, etc. Things are going to have to fall in place almost perfectly like clock work too. However, very few thiings work out exactly like they should. Also, if you plan to attend a lot of shows, expect the calf not to gain as well. With that said, I've seen it done before plenty of times, but not all genetics are capable of doing that.
My advice is this... if you have never finished a calf in 14 months & if you don't know the genetics of the calf you are feeding (how quickly it will gain & finish), don't try it!!