The longest version of the 1968 Iron Butterfly song 'In-A-Gadda-Da-Vida' played for how many minutes?

Remember it well. The psychedelic 60's.

The very first rock concert I went to was Steppenwolf and Iron Butterfly in Baltimore MD in 1969. they played a 35 minute version at that show.

I remember them as a garage band in the Clairemont area of San Diego.

Great drum solo!