A hiker started to climb up a hill at 6 am and either kept climbing up or rested at some place(s). He reached the top at 6 pm. He rested there for the next 12 hours. The next day at 6 am he began to travel down the same path. He either moved downward or rested at some place(s). For the up and down trips, how many times was he at the same place at the same time