Yes, just as long as they have been Set on the field for at least one turn.
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yes to the loser who put this!!
You can activate Quickplay Spell cards in your opponent's turn, if you have Set them on the field. As well as that, some of your face-up continuous and continuous-like cards may have a trigger than activates when a certain condition is met, these can activate in the opponent's turn too (Black Garden is one).
yes of course limit up to five
regular spell cards can be activated only on your turn, quick play spell cards can be set then activated during your opponents or your turn, and spell cards with the infinity sign are treated like regular spell cards but stay on the field until it is destroyed traps cannot be activated from you hand they must first be set then activated on your next turn or your opponents turn knowing when to activate these spell or trap cards is tricky you have to know when to activate them or they will end up not helping you out at all
At most, 10; this is because you may end up activating all 5 of both your opponent's and your own cards each, but cannot play any more and have them activate that same turn.