Typically in the UK outfits I have worked for
-We can get up as soon as we receive a double dong from the front end (normally about a minute after rotate)
-Anything but light turb the belts go on and hot drinks service ceases
-Below 10,000 ; depends on whether we get four dongs (normally about 5 mins before landing -varies from 10 mins to 1 min before -dep on memory)