In the 777 a standard hold takes approx 6 mins to do. In the A330 due to the reduced AOB in turns it can take about 8 to 9 mins. (3 to 3.5 just for each 180 turn)
Although having said that the bus did the turns last week at 30 deg AOB!!?
The Bus seems to limit the AOB at high levels above FL200 whereas the 777 didn't.
( from memory
)