Saving throws for multiple round attacks

[Schade]

I am sure this has been answered - but I cant seem to find it anywhere.

The example I am looking at is confusion - which allows a Will negated saving throw. The effect lasts 1 round per caster level (8 rounds in my example).

My question is - do they get a saving throw each round or just when the spell is first cast?

Thanks!

[kinevon]

Unless it says otherwise, like the blindness caused by glitterdust, it is a single save at the beginning of the effect.