Went through that... In the end the story progression so far means it isn't that far fetched that you'd just drop in... Kekai Sensen team's pretty much not moved from where they started... Blazblue team's just finishing up a fight that's like a block away from dropoff point...

Resident Evil's the odd one out in that the initial team's definitely moved a significant distance away from the portal drop off point...

As far as how much time's past... that BB fight couldn't have lasted more than a few minutes...