Is it a bad thing to do more than one? Even though there will only be one or two sessions a week for each one so that's only around 2 hours per week!
How did you find them when it comes to getting fit and being practical?
I'd like to be prepared for all sorts of situations, but I think up close will probably be the best one when it comes to getting dirty
Well, the main risk I see is that you'll find it difficult to progress in any one of them, since they can be quite different and you want to build up muscle memory as well. E.g. - Kickboxing is teaching me to always keep my back heel off the floor and lean into a punch for maximum power. Wing chun has always been the opposite - keep your feet grounded and your weight on your back leg. Don't lean into a punch because you may over extend yourself.
Difficult to explain in a written format, but with kickboxing, you punch hard and get a lot of power since you're leaning in and putting in some solid body weight behind it. However, the danger is that when you lean in, if they manage to grab your arm, they can easily put you off balance because of the stance. Wing chun counters this by keeping the weight on the back leg, so if someone grabs your arm, you stay on balance and it's relatively easy to pull back. However, for this, it sacrifices power. It took me/is taking me a while to get used to this since I did wing chun for 3 years and have been doing kickboxing only for a couple of months. If you do too many different martial arts together, I suspect you'll find it tricky to properly do one and get settled into it.
2 hours a week isn't a huge amount, but it isn't terrible. To be honest, it's one of the main reasons I took up kickboxing where I am - they have classes about 6 times a week so I can go more often.
For being practical - I would agree with all the other advice given here. Learn it, but don't expect to be able to use it. I think it will be years before you're in any sort of shape to be able to practically use it. Needs to be instinctual rather than thought out for that, and that would take a very long time. For fitness, i'm probably the wrong person to ask since i'm not particularly fit...but i'd say a martial art like kickboxing, muay thai etc., which has a lot of movement, is probably better, just because you are moving around. Kung Fu focuses on techniques as well, so you may not move around quite as much.
I found wing chun good for up close since it teaches you how to get in very close, do quick strikes, and move back again. Though if you're against someone who attacks more medium range/at a distance, and knows how to maintain it, then you'd struggle more I suspect. The analogy my wing chun instructor gave was that karate for instance, a punch is like a shotgun. Slow, but lots of power. Wing chun is more like a machine gun, very fast punches, each one with not that much power, but collectively adds up.
Just personal thoughts all these mind you rather than speaking from solid experience
).
it's why even top boxers have bodyguards.