The location of the hole (perforation) in the eardrum also effects the degree of hearing loss. If severe trauma (e.g. skull fracture) disrupts the bones in the middle ear which transmit sound or causes injury to the inner ear structures, the loss of hearing maybe quite severe.
1 Resting 1-3 minutes between sets is probably ideal for you. 2  The higher your training intensity is for a given exercise and/or the more demanding it is on your body, the more you should stay nearer to the 2-3 minute range.
You can get a good estimate of how long you'll wait for the next train by using the posted wait time sign outside each station. It'll either list 5 minutes (three trains operating), 10 minutes (two trains), or 20 minutes (only one train). Just be warned that you might not make it on the next train, depending on how many folks depart at your stop and how many fellow guests are waiting to board.