Quick question: spontaneous casting time with 2+ metamagic

[Li Shenron]

If my sorceress casts a spell with 2 metamagic feats applied, do the extra casting times stack? I think they do, but I am suddenly not sure...

The first increase is from 1 action to 1 full-round action. Are the following increases one more full-round action each?

E.g. casting an empowered + extended spell does it increase casting time to one round + one full-round action (meaning that the spell goes off at the end of my turn in the next round) or two rounds (meaning that the spell goes off at the beginning of my turn in the second next round)?

Thanks!

 

[Caliban]

No, they don't stack. You could apply 5 metamagic feats to one spell, and it would still be only one full round casting time.

 

[Li Shenron]

Thank you Caliban, you have just made my sorceress happy