The average flight time from San Francisco to London (on a non-stop flight) looks to be about 10 hours.

A search on travelocity for Feb. 13, 2004 from SFO to LHR yields:

British Airways: Travel Time 10hrs 35 min
Continental Airlines (Virgin Atlantic): 9hrs 45 min
Roundtrip Ticket from $571
Flight + Hotel Deal (Roundtrip) from $1500

 

The area around Matamata was transformed in the the villiage of Hobbiton. Farm, Matamata.
Read more in "The Lord of the Rings Location Guidebook" by Ian Brodie

Recommended visits:

Waikato[Port Waikato] -Weathertop, Amon Sul
Hamilton - 4th largest city in New Zealan
Matamata - Hobbiton farm