Rides are set by time rather than distance, because one person's 80 mile ride can take several hours longer than another person's, depending on terrain, weather, the bike they use and their power output. You will ride faster on race day than in training, so it's time in the saddle that counts most when training.
Workouts need to increase your endurance for IRONMAN, without leaving you injured or needing to rest for several days afterwards, it's not what you do in one workout that counts, but what you do consistently over a period of months.
IRONMAN 140.6 is a unique challenge, it's the one race where you can't realistically cover the actual distances in training without needing to take serious recovery time.
Workouts are created mindful of the fact that people have family/social responsibilities at weekends, so we prioritise efficient and effective training. There is no great benefit to spending the entire day riding slowly.
The long rides in your IRONMAN training (which progress up to 5 hours long) will often include efforts at above race-pace and a run off the bike. If harder, you would not be fresh enough to train effectively for the remainder of your training that week, which includes a long run.
If you can do these long bike sessions in the middle of a tough training block, you can be very confident that after a taper period you'll be fit enough to do well at an Ironman.
If you feel that you will benefit psychologically by doing one or two rides by distance to help build your confidence (e.g. 100 miles), feel free to do this with around 6 weeks to go before race day. Just make sure you consume around 100-150 calories of carbohydrate every 30 minutes to boost your glycogen levels.
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