Surprisingly quickly.
In 1986/7 the QE2 was re-engined and this included adding controllable pitch (CP) functionality to her gigantic propellors that allow immediate reverse power to be available.
She can slow from 30 knots (she still is the fastest liner in the world) to a half knot in 3 minutes, which takes one mile. 12 minutes later she will be doing 19 knots astern.
QE2 is 963 feet long (293.53m)
She is 963 feet long.
Around an hour, if you're using the QE2.
Qe2
Titanic__Nope, not the Titanic. The QE2 is 953ft and the Titanic was 882.75 ft. So QE2 wins by a nose.If you are interested in comparing the Titanic to other modern ships, check out the website "Comparing Titanic to Modern Ships".QE2
QE2's keel was laid on July 2nd 1965, she was launched on September 20th 1967 and she sailed away from the shipyard on November 19th 1968 which would arguably be her date of completion. Her official maiden voyage was 2nd of May 1969.
The QE2 was longer than The Titanic.
QE2 weighs 70327 Gross Tons and 37182 Net.
The QE2 by 30 meteres (100 feet)
QE2 was about 33meters longer than the Titanic
QE2's record was 3 days and 20 hours for the crossing, but for over 30 years she maintained a 5 night crossing schedule. This was later increased to 6 days to reduce wear and tear on the ageing ship, as well as to reduce fuel costs and make more money!
It will take a long time. But if you stop CFC's, the disappearing will stop too.