How Much is enough?
Don't worry about the total lenght f your workout - think rather on have you done at least 1-2 full distance swims, bikes and runs - if you have then you should be all set. It wouldn't make sense to do a half IM in prep for a half IM now would it. A hlaf IM in prep for IM is fine.
If you haven't done the full distances get them done in the swim (for confidence) and bike - teh run will fall into place once you get one the course . Don't neglect to taper either.
The first year that I did HIM's I followed an IM training plan - just to see how the additional training affected me - as a prep for doing an IM the following year. And depending on where you want to finish all comes into play with the amount of time for training.
4.5 hours is a good w/o. Best thing is to be sure that you have done some 30 min runs immediately following your long bike.
And a race simulation does not mean doing the full distances, but rather doing all three disciplines in immediate succession - so that you simulate the race day, but not need as much recovery. It is a good thing to do these simulations - really test out your nutrition and hydration plan.
If you are close to your HIM - i.e. ready to taper - do NOT do any additional big sessions now. Just be confident that you did put in the training as laid out in your plan and that you will be ready.
Good luck - let us know how you do! :D
RV
It takes a long time to get good. - Scott Molina
Slow is smooth; smooth is fast. - Rich Strauss


In preparing for a 1/2 ironman, how long (time wise) are your longest training sessions? Generally speaking, How much is enough? Does everybody everybody do a couple simulations of the race or no simulations at all. The reason I ask is because I'm doing my first 1/2 ironman soon, and my longest workout consists of a 4 1/2 hour workout. I'm afraid it might not be enough. I've become slightly worried. I appreciate the help and feedback.
mlbucey
"It's not how much you have left, it's how far you've already gone."