Generally pretty obliging, they do try to give you your requests. Most people would get 10 in a row as they request, especially the long haul commuters. Occasionally 8 +2 and many people now split into 2 X 5 or so to keep from the mammoth times away from home.
Just bear in mind it only takes yet another change of rosterer (4 in the last 2 years) for the policy to change. The contract is the final arbiter!