It's funny. usually in games like these they give reason for the main villain to destroy the world or something like that. The only line in the game that could be considered as reason for time compression would propably be:


Esthar Airstation: Rinoa? The sorceress!? She's on the ship!?

Squall: (So... It's true? Rinoa is a sorceress?)

Rinoa: I've... become a sorceress. I can't stay with you anymore, Squall.

Esthar Airstation: Respond, Ragnarok!

Rinoa: I don't want the future. I want the present to stand still. I just want
to stay here with you...

Squall: (Rinoa...)

Esthar Airstation: Respond, Ragnarok!

Rinoa: Nobody would want to be around me anymore...
Yay! Here we go with the R=U theory but basically with parallel universes and sorceress sealing this could be possible (GameFAQs FF8 Plot analysis). (Well with time travel and parallel universes you could create any kinds of theories so it's totally pointless to argue about anything related to these theories. The hell, I could propably even create a theory about Ultimecia being Squall's mom with stuff like this.)

Well myself I find that the only reason I can think of for someone compressing time.