n = 10 per group, 2000 runs, B = 999: permutation RMST test p < 0.05 with no true difference 0.0480; crossing curves 0.2205
n = 20 per group, 2000 runs, B = 999: permutation RMST test p < 0.05 with no true difference 0.0480; crossing curves 0.3950
Worked example: RMST difference 12.887 days, permutation p = 0.0444 (B = 9999)