Strength training day, but can't do it.

[skully]

Okay, so I have a little situation and a few questions as well...

workouts are supposed to be like this:

Sat: weights
Sun: cardio
Mon: weights
Tue: Cardio
Wed: weights
Thur: Light or off
Friday: Cardio

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So on monday, I will not have time for weights, because I will be out for at least 9 hours in total, and I would be dead tired. The day will be SUPER active, a lot of walking.

So, should I skip weights till wed, or make it up on Tuesday w/ 15-20 minutes cardio afterwards?

What would happen if I do weights within 24 hours? Just for once? Will I be doing a lot of damage to muscles?

I notice this female at the gym, everyday is there, training (weights) for so long...that's over training obviously, and yes, the same muscles...yet she is pretty lean with strong muscles.

Any thoughts?

Also, what is the best way to gain muscles? I am doing 3 sets, 10 reps each. Sometimes even, 10-8-6, depending on capability with the increases weights.

I'd usually do like 4kgs-5kgs-6kgs(free weights bis/tris), or something like 15kgs-20kgs-20kgs (backs), 40kgs-40kgs-50kgs (legs) would that help me gain muscles?

[skully]

I have a question...

I noticed that there are a lot of information out there about toning, strengthening, gaining muscles...and the "resting" period. I am very confused about the whole thing really.

I don't really "rest" much between sets, maybe about 30sec only, and weights usually get higher w/ lesser reps.

Is there a difference between "gaining muscles workout" followed by a "strengthening/toning muscles workout?"