There is no direct train service between London and Turkey, you would have to change trains at least twice so I would estimate the total journey to take about three days - as opposed to three hours by plane.
You can't travel directly from Heathrow to Bristol. The best way is probably to take a bus to Reading and get a train from there or travel into Central London and get a train there.
about 20 h
About two days
About 4 hours
About 2.5 hours
About 35 minutes.
There are no trains from Minnesota to London, England. Train travel is not possible across the Atlantic ocean.
You can't travel directly from Amsterdam to London by ferry because London doesn't have a ferry port. You would have to travel from Amsterdam to Hook of Holland by train (or drive), catch a ferry to Harwich and then take a train (or drive) to London.
The Eurostar train takes around 2 hours and 15 minutes to travel from London to Paris.
About 1 hour 30 minutes by train.
I suppose that 50 hours is sufficient.
Malta is an island in the Mediterranean Sea so you can't travel there by train from anywhere.