"A flotilla of more than 1,000 boats marked the Queen's 60 years on the throne."
"The Thames Diamond Jubilee Pageant made its way 10 miles along the river from Battersea to Tower Bridge, where an “Avenue of Sail” – made up 98 vessels too large to join the pageant itself – was waiting.
Figures from the organisers showed that the total number of craft expected to be on the water for the historic occasion – including safety boats and those moored along the route – is 1,066.
Such was the fleet’s size, it took 75 minutes to pass."
~Above from http://www.telegraph.co.uk/news/uknews/the_queens_diamond_jubilee/9302247/The-Queens-Thames-Diamond-Jubilee-Pageant-in-all-its-glory.html where you can view a video and read more Diamond Jubilee news.