Character Card question, and mech card question

1. Is the mechanic character card capped on the extra duration you can have?

2. If I have a mech card in my 1st and 2nd deck, will they stack for 30% bonus duration? (assume theyre both S-level)

3. What are the exact changes coming to character card system? Ive read somewhere that you will only be able to have 1 class card in all decks, but theyre giving you an extra deck. Is this true? What else is there?

thank you very much

yes, they should stack, the change is that you get 9 character card slots (3 sets) but can't use the same class more than once (so your second mech would turn useless.)

thx