After Spike connected to the delivery station in his home, he dropped the leystone onto the ground and pushed his head into it. His body slowly disappeared, little by little, into the leystone.
It took him nearly two hours to get into the leystone. It will take him even longer to get home.
It will take him one week to get home since he is so small and weak. To him, time will be stagnant and will seem as if the transportation only took a few seconds. But time will be flowing in the world, and during this time, his transportation can be interfered with or interrupted.
This possibility of being interrupted is why he didn't tell the Sun King that he was leaving. He didn't want the Sun King leaking the news or doing something to interfere with his escape.
