: How to prevent immune system from weakening if you are training multiple hours a day all week? I have heard multiple times that going to the gym for about 2 hrs.+ each day often, weakens your immune system for a while, and

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I've never noticed this temporary immune system crash from training, however, to strengthen it so you can avoid the crash and get the most from your workouts/avoid overtraining injury, which I'd be more concerned about:

Sleep at least 7.5 hours (go for 9 during the first month)
Eat clean
Drink a lot of water, like a glass every few hours
Don't drink alcohol/don't smoke anything (just for the first month)

I'm assuming you never trained like this before, so the above will definitely get you a good start.

Good luck, avoid injury (don't get lazy and cheat on form etc/don't try to do too much)

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I'll be honest, there are some people who spend 2 hours in the gym and they accomplish less than others who spend only 45 minutes. Keep in mind that is a huge investment in time and energy, and without a great plan of attack you will end up doing too much too soon. The people who are spending 2 hours a day in the gym have built up their work capacity over time to handle the stress of that kind of work.

Managing Recovery

Managing recovery is the priority number 1 when dealing with this kind of work volume:

Make sure you get at least 8 hours of sleep a day. Take naps if you have to.
Nutrition becomes very important. You will likely need pre, post, and intra-workout fuel. Chocolate milk can be very good for this.
Limit yourself to only taking caffeine prior to working out. Caffeine can affect your sleep, and your natural recovery so only use the stimulant when you need to do work (coffee, sodas, caffeine pills, etc.)
When you are resting, rest
No extra work. Have your plan and execute it. Throwing in extra work can dig a deeper recovery hole.
Vary weight and reps throughout the week. One or two days will have higher weight with fewer reps, and the rest will have lower weight with higher reps.
Incorporate cooldown walks as part of your training regimen. The slow and steady cardio can help your muscles recover from the work you've done

Coaching

When you are really pushing yourself, it pays to get a coach to manage your workload for you. They know how to help you navigate managing your recovery and adjust training as necessary. They also will end up pushing you harder than you would yourself.

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Moderate exercise boosts your immune system, but you experience diminishing returns as you increase in intensity (one study here).

The two biggest factors that can have negative effects on your immune system are inflammation (inflammation suppresses your immune cells), and overtraining syndrome (list of symptoms to monitor).

David and Berin's answers are solid; get plenty of sleep, eat right (especially avoiding foods that cause an inflammatory response in your body), and allow yourself to recover.

The only thing I would add, especially if your going hard during those two hours, is listen to your body before, during, and after training. Consider monitoring biomarkers like HR, HRV, CNS tap testing on a daily basis; push through discomfort, but don't push through pain; and on the days you're working out, if you're not feeling it, don't kill it.