Yes Herod, rotary always (then) had much shorter training times - and little or no holding.
I joined in Feb '68, and was on my first Squadron in June/July '70. A bit longer than you, but in addition to JP, Sioux and Whirlwind, I had Chipmunk at the start and Wessex to finish, so qualified on 5 types in just over 2 years service (and less than 2 years flying......). An' ye tell that t't' young folk o' today, an' they'll not believe yer.......
[Just checked Log Book Vol 1 - in case memory might be playing tricks - July 18th '68 Chipmunk famil, Jun 30th '70 first trip on Squadron. A total of 330-odd hours: 60 hrs Chipmunk, 141 hrs JP [all Mk 4, but that's another story...], 44 hrs Sioux, 59 hrs Whirlwind and 31 hrs Wessex!]