He's entitled to a trial within 70 days of his first appearance in the US, if he demands one. Speedy Trial Act of 1974.
This man is not a USA citizen, and was not in USA when he did the journalism that so offends the USA deep state. He will be extradited for purely political "crimes". Let's not pretend anymore that any of us live in societies governed by laws.
He won't get a bond either because of all the stuff that happened with the Bolivian Embassy.
Personally, I don't think we should extradite him simply because it's arguably a political 'crime'. The US/UK extradition treaty is so one-sided, though, and British extradition law so Executive-friendly, that that is essentially an impossible case to win if the Secretary of State wants to extradite.