how long does it take for a takeover or giveback operation to complete in clustered NetApp Filers

In a NetApp Filer cluster how long does it take for takeover or giveback to be initiated and completed?
Takeover or giveback is initiated after 30 seconds of not hearing from the partner. In Data ONTAP 7.0, it takes up to 180 seconds for the takeover/giveback process to complete. Older releases require an additional 45 seconds to complete the takeover/giveback