The Emirates website can clarify this matter. Link

http://www.emirates.com/english/plan...stopovers.aspx

Quote from website

As a special courtesy to our passengers, in certain cases where an itinerary calls for a long stopover in Dubai, Emirates will cover accommodation, meals and ground transportation costs.

This service is offered to:
Economy Class passengers
If the booking class for the entire outbound or inbound leg of their journey is N, M, E, W, R or Y.
If the connection time until the first available flight is more than 8 hours and less than 24 hours.

First Class and Business Class passengers
If the booking class for the entire outbound or inbound leg of their journey is J, D, C, I, O, F, P, Z or A.
If the connection time until the first available flight is more than 6 hours and less than 24 hours.

Long stopover expenses may also be covered in other cases, such as Skywards redemption bookings, and other rules may apply.