I used to do AMS <-> LON quite a bit a few years back. It was 5 hours with eurostar door to door or about 3 for flying for me. So I only did eurostar when I had

I used to do AMS <-> LON quite a bit a few years back. It was 5 hours with eurostar door to door or about 3 for flying for me. So I only did eurostar when I had the time and wanted to look out the window or had lots of luggage. It was generally more expensive but deals could be found if booking enough in advance.