How Much Training is Over-training?

It is entirely possible to train all 3 or combinations of 2 a day up to a point ........ long distance and elite athletes do it all the time.

Key things to keep in mind are nutrition and rest between workouts, proper training load stresses so that you are not working the same muscle group or cardio ranges continuously, gradual increases in overall volume and intensity, step bakc weeks to allow adaptations to take place, knowing when to say "when" and back it off in workouts, etc.

It is really not something you just want to charge into, because that WILL lead to overtraining quickly.  If you have not already, I would suggest reading some of the different training plans that BT offers and see if any of those can apply to what your goals are.  Some things to ask yourself are:

Are you training for one specific race?  Are you looking for just a good workout schedule?  What is your current training load?  How much time do you have available to train, to rest, to eat?

Definitely recommend reading many of the various articles the site has and perusing the forums.  you can pick up a lot by just reading.  And if it is to overwhelming, have you thought about a coach?

another article link

http://www.competitorsocal.com/training/over-training.html  

Much of this depends on your current fitness level in the 3 events. 

One thing to remember is the total volume or distance increase guidelines.

10% increase per week is quoted for running most often.  A little more for swimming and biking.  Increasing more than that per week will drastically increase your chances of injury and overuse issues and your body will have a more difficult time recovering.

Also, don't forget to incorporate recovery weeks.  Many plans use a 3 week build and 1 week recovery with a reduction in volume on the 4th week.  Others, a 3/1.  This may vary based on your fitness level and other factors such as timeline.

Most will suggest that one rest day per week is vital.  Probably 2 or 3 days per week spread out may be good if you are just getting started. 

Transition and brick practice are important but in your case, I would wait until the about 2 weeks before your tri to incorporate them. 

Cool!

Thanks for all the advice.  I've read most of the articles on this site to include the 13 and 16 week plans, couch potato to sprint article, etc ... and increasing 10% .... but after first learning about the different distance triathlons and esp. the Sprint Tri, and researching this and other sites and reading so many articles, I got to thinking that I might could possible do a Sprint.

That was back on Aug 1st, and the bug bit me so hard that I was not willing to complete a full13 or 16 week program but instead run in the very next Sprint even in my area - which happens to be Sept 14th.  So, I had/have about 5-6 weeks to prepare.

I've been doing cardio since March, but nothing like this.  So I thought about training 2 areas in a day and even all 3 in a week or two from now ... just didn't know if this might be too much.

I have every day to train and have completely cleared my schedule so that I have from 6:30 pm to 10:00 pm every day to train, and all day long on Sat. and Sun.  I've even started biking some during my lunch break at work.

So, I guess I'll follow the advice one gave about trying to listen to what my body says and if I get sick feeling to whatever ... anyhow, I'll probably mess up something regardless being that this is my first event coming up and I'm rushing into so quickly ...

Or under recovered.