If the reserve is at the low end of estimates, 6 Bbbl, that will mean throughput of 1.2MM for 4800/1.2 or 4000 days, about 11 years.
This is well PAST worthwhile, all envirodork spinning to the contrary.
These guys pooh poohing ANWR's reserves will be singing a different tune when their tank runs dry someday and it costs $350 to fill it up.