take a random battle, where you have a unit hp of 60. it gets injured by 35, so has hp 25.
how long does it take to heal when a) training at :15
b) training at :29
in both cases, it takes 2 ticks to get healed. so at :30 the unit'll be injured for 1 tick and at :00 it'll be fully healed. the hospital only shows how many ticks the unit is injured, not how many HPs it has yet to heal. if you trained at :01 or :31, you will most likely have to wait 1 tick less.
