I usually tell students just use the one minute then once established use the 4nm for the legs ... lets say you used a teardrop entry and flew out for 4nm, you would have to make one really shallow turn to come back in to intercept that inbound course ... if you stick with the 1 minute entries its just fly out for 1 minute then should be right about a standard rate to intercept your inbound course which establishes you in the hold ... just my .02 and what i tell my guys to do i think its easiest ... no references sorry