Spontaneous caster + multiple metamagic

[Murdock Mudeater]

Double checking. If my Sorcerer or Oracle wants to apply multiple metamagic feats to a single spell, does it increase my casting time twice?

For example, I want Burning Hands cast without Somatic Component (Still Spell) and I want it to deal non-lethal damage (Merciful Spell). As a Spontaneous caster, applying a metamagic feat increases the casting time from a Standard action to a Full Round action. Now, if I apply the second metamagic feat, do we consider this already modified spell a Full Round Action spell, thus increasing the casting time to 2 Full Round Actions, or since the initial spell is a Standard action, does it remain a single Full Round action?

If wondering, I'm trying to determine the viability of a Sorcerer or Oracle that uses lots of metamagic feats. Obviously, Burning Hands requiring 2 turns to cast is not viable, but not being viable could still be the RAW answer...

[Dasrak]

No, the metamagic increase is based on the spell's normal casting speed. You can apply as many metamagic as you like and only get the standard casting time increase. There are a lot of popular Sorcerer builds that would be completely invalidated if you couldn't stack metamagic like this.

[Murdock Mudeater]

Thank you very much.

Hey, somewhat on subject, can you prepare metamagic modfied spells in Domain Spell Slots (provided that it is a Domain spell that is being modified)?

[Dasrak]

Yes, it's a spell granted by your domain so you can prepare it in your domain slot.

[Murdock Mudeater]

Awesome, Thanks again.