If player play 2 laboratory card (and draw a clue card), in following turn can be added a third lab card to draw another clue card (or 2 clue cards if lab cards are of the same color)? Or il mandatory play all lab cards in the same turn to draw clue cards?
If you adds a breach in a room with only 1 opening, is the room than considered with 1 or 2 openings for clue card requisite?
No. You have to do in the same turn.