1 0 2 8 2 1 1621 7 50% 4 811 1 0 2 8 2 1 1621 7 50% 4 811 0-10s 1 11-30s 0 31-60s 0 1-2 min 0 2-4 min 0 4-7 min 0 7-10 min 0 10-15 min 0 15-30 min 1 30+ min 0