Survey rate
At least some data were obtained on 61/99 of nights so far allocated to survey.
Over all nights with any data, the mean number of fields/night is 4.5.
Averaged over year, expect to get 7 fields for each completely clear night = 3000 z’s per night
Full survey requires about 100 clear dark nights, or all dark time for 1 year. In practice 2dFGRS uses about 1/3 AAT dark and will take 3 years