Which route are you flying? Emirates only flies from Terminal 3 and I don't think any other airline serves DXB with an A380, so sounds like you're going to be in and out of T3 (in fact concourses A, B and C, T3 is the landside check-in and arrivals area). I wouldn't worry too much, not much you can do anyway. If you miss the onward flight they'll rebook you on the next one and provide a hotel if it's a very long wait.