1 hour and 5 minutes.
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.
2'10
30 minutes if there are no issues in the London station
It will take about 7 hours.
travel by bus from London to Aberdeen it takes 364 days
1 DAY
About 6 hours from Gatwick
About two hours.
It depends on where in the US you are going to.
About two days
About four hours.
About 4 hours