Saint Matthew's conversion must be one of the quickest in Scripture. Jesus invited him to follow and he did. There's no indication that he asked Jesus if he could wait until closing time or give him some time to think about it, or flesh-out the 3 year plan. That Jesus would call a hated tax-collector to be one of his closest associates was bad enough, but then Jesus attended the party Matthew threw in his home with party-goers who were not exactly on the A list of Pharisaical Society. Quite a lot to pray about in this story about call and conversion.
There seems to be little excuse for not accepting Jesus' invitation to discipleship as Matthew did, don't you think?