I have an active trade that was proposed to me, I accepted it, conirmed my Address and it's been a few days and they still have not confirmed theirs. I would like this trade to take place but i there are other trades i could make with the card that is pending on me recieving their address, in this situation how long should i wait for them to do the next step?

As far as the rules go, you can cancel at any time up to the point when both addresses are confirmed. So, if he hasn't confirmed his address, then you have no obligation to stick around.

If it were me, personally, and they weren't responding to messages, then I'd only give it like 2-3 days, possibly less, depending upon the cards and value and how much I wanted to actually make the trade.

I'd also check if they've been online recently. Not really a clear indication that they've been ignoring your trade, but at least you'll have an idea.