1..18
ok 1 - 11:00 -> 13:00: Avg = 12:00    [HH:MM]
ok 2 - 11:00 -> 13:00: Avg = 12:00:00 [HH:MM:SS]
ok 3 - 23:00 -> 01:00: Avg = 00:00    [HH:MM]
ok 4 - 23:00 -> 01:00: Avg = 00:00:00 [HH:MM:SS]
ok 5 - 23:30 -> 00:30: Avg = 00:00    [HH:MM]
ok 6 - 23:30 -> 00:30: Avg = 00:00:00 [HH:MM:SS]
ok 7 - 12:00 -> 12:00: Avg = 12:00    [HH:MM]
ok 8 - 12:00 -> 12:00: Avg = 12:00:00 [HH:MM:SS]
ok 9 - 00:00 -> 00:00: Avg = 00:00    [HH:MM]
ok 10 - 00:00 -> 00:00: Avg = 00:00:00 [HH:MM:SS]
ok 11 - 00:00 -> 00:02: Avg = 00:01    [HH:MM]
ok 12 - 00:00 -> 00:02: Avg = 00:01:00 [HH:MM:SS]
ok 13 - 00:00 -> 00:01: Avg = 00:00    [HH:MM]
ok 14 - 00:00 -> 00:01: Avg = 00:00:30 [HH:MM:SS]
ok 15 - 23:58 -> 00:00: Avg = 23:59    [HH:MM]
ok 16 - 23:58 -> 00:00: Avg = 23:59:00 [HH:MM:SS]
ok 17 - 23:59 -> 00:00: Avg = 23:59    [HH:MM]
ok 18 - 23:59 -> 00:00: Avg = 23:59:30 [HH:MM:SS]