SMOC, as GR says it is up to you and your bean counters how long you want to fly it (see B52).
As for 47 the DSO (design service objective) is 20,000 cycles. Now since you've mentioned it was a short hopper (ANA) this might change a few thing since a flight profile for that model was quite different then for the regular fleet.
Cheers
Last edited by Grunf; 24th August 2006 at 20:16.