How long does international shipping take?

So I ordered an iPhone 6 from the USA and I'm in England. How long would delivery take, roughly?

Depends on when it ships. If it's back-ordered, it could take weeks.

If it's in stock and ships right away, it depends on the shipping method chosen. Overnight? Economy?

Detailed questions will get detailed answers.

Depends on the courier you chose & the shipping option you chose.