Originally Posted by
Metanoia
You can stay in T3 as long as you like. Taking the bus to T2 unfortunately means leaving the secure area, so keep in mind that you will need to re-clear security on the way to T2.
Also, some press releases by EK seem to imply that FZ J passengers will have access to lounges but that may be only for FZ flights leaving from T3 - these were flights mostly to eastern European countries. YMMV.
Just add: Upon arrival in DXB you would follow connections and have to go through security then up to the lounges. You would have to clear security again in Terminal 2. Also I've heard that the experience taking the bus to T2 is not the most efficient so leave enough time for that.