How many times longer than an Association football pitch is the stadium in Prague at which the Spartakiads took place?
Spartakiad (Czechoslovakia):  The Spartakiads took place at the Strahov Stadium, the largest stadium ever built and the venue of the last pre-war Sokol gathering. Strahov Stadium: The Great Strahov Stadium (Czech: Velký strahovský stadion ) is a stadium in the Strahov district of Prague, Czech Republic. Strahov Stadium:  It was built for displays of synchronized gymnastics on a massive scale, with a field three times as long as and three times as wide as than the standard Association football pitch.
three