Is there a maximum range for sustained spells?

I.e. can a mage in Seattle cast increase attribute on somebody else and then sit at home while the other person flies to London? When the mage falls unconscious the spell will drop, but does the distance have any effect?

If a mage casts at a high force, gets plenty of successes, has a good telescope, and is immortal then he can potentially levitate someone to Alpha Centauri. I wouldn't recomend it but it can be done. Likelikewise, Levitation from the Earth to the Moon should be possible and far more plausable. Distance doesn't really matter.

Which is...horribly broken. Spell distance/range is one of my long standing peeves...

But hey, that's just me.

do you need to remain LOS for a sustained spell?

No, but you need LOS to move or change a sustained spell.

For example, if you cast a Trid Phantasm of Godzilla and just want it to stand there and do nothing you're okay without LOS. However, if you want a Trid Phantasm of Godzilla roaring and crushing ships you'll need LOS to animate it. Likewise, if you want to have a person levitate in place you can leave them hovering in one spot indeffinantly without LOS, but you need LOS if you want to move your Levitate target.