Many of my students are playing solos with multiple movements for the first time this year, and I usually explain the time they should allow between movements as bring similar to the time between tracks on a CD. But there is one exception...
ME: The only time you'd have to go
straight into the next movement is if the music says "attacca" at the
end of the previous movement.
KID: If it says what?
ME: Attacca. A-T-T-A-C-C-A.
KID: Oh! I thought you said "a taco."
ME: Yeah, because you'd definitely want to stop and eat a taco between movements. That'd be really good for the horn...