Seren, I wasn't implying the swim is 1/3 bike duration.
The question was about the amount of time investment for relative gains i.e. a relative gain of 20 mins from 2-3 hours swim training vs a 60 minute relative gain from 6-9 hours bike training.
Putting it another way, if a mid packer is going to commit to 2-3 hours extra training a week I think there is almost as much chance they'll gain 20 mins overall by focussing their training on swimming. Im not saying they'll swim 20 mins quicker in the pool but if they focussed a portion on OW training, swimming straight, drafting, optimising their line, then factor the benefits of swimming with the faster pull the sum is greater than the parts.
What's not fully understood by many if the benefit on the bike. As far as im aware the draft zone is still 10m for age groupers. I thought its only the Pro's that now have 12m?
Putting that aside, if you just consider that being a better swimmer could mean their are 360 more people to pass you on the bike, that's 360 small pulls as riders overtake you, its up to 2 hours (360 x 20 seconds) legally in their draft zone as you drop back.
List of willing volunteers Barley Cougie (very likely) Seren Mr Seren Flat Footed Teapot One Duda (provisional) Mini Dudas (provisional) Not so Jr Magna Carter 1 Not so Jr Magna Carter 2 Boo & Mrs Boo (provisional) Mrs Digger Digger (after swim) Durhambiker Mixed Grill Mother of Mixed Grill Mrs Scuba Scuba jnr 1 Scuba jnr 2 Nurse Ratched (for a wee while, if possible, before my jog) Mrs Cheggers A Cheggers child Paperwife Paperboy Simo Happychap (possibly) SuckItUp Mrs Bristolsparks Button Mushroom Mrs Button Mushroom Mini 'Shroom Nutty Nikki Mini Nut 1 Mini Nut 2 Frags (back-up banana) Little Sister The Evil Pixie Bobs Your Father + Bobs Your Grandfather (probably) Kanga