I've got the Welser-Most recording on EMI - 4 movements, 43 minutes long.
Are we talking about Franz Schmidt's 4th symphony?
Too long for a music bake-off.
I guess we're both right: it's one continuous piece but comes in four sections. Listening to it again this afternoon, the four movements are quite discernible.
I'd never seriously play all of it at one of these kind of events but it's a great piece in my view and rarely heard, in the concert hall at least, in the UK.
If you can't make it to the July (?) event, I'll play some of it in your honour.