From the SRD
Bitom and I both agree that this rule kinda stinks. I have known about it, and always ignored it. Offically, in the vWorld games I'm running this rule is repealed. Meaning that Sorcerers and Bards (and others) can apply Metamagic as no further time cost. Since you've spent a Feat on it, I don't wish to further penalize those with already low casting options.SRD wrote: Sorcerers and Bards
Sorcerers and bards choose spells as they cast them. They can choose when they cast their spells whether to apply their metamagic feats to improve them. As with other spellcasters, the improved spell uses up a higher-level spell slot. But because the sorcerer or bard has not prepared the spell in a metamagic form in advance, he must apply the metamagic feat on the spot. Therefore, such a character must also take more time to cast a metamagic spell (one enhanced by a metamagic feat) than he does to cast a regular spell. If the spell's normal casting time is 1 standard action, casting a metamagic version is a full-round action for a sorcerer or bard. (This isn't the same as a 1-round casting time.)
For a spell with a longer casting time, it takes an extra full-round action to cast the spell.
The rule however for clerics or druids, spontaneously converting a spell and applying a metamagic feat still applies. Since you already are making one change to a spell slot, it makes sense another further change causes some time issues. The rule stands as
SRD wrote:Spontaneous Casting and Metamagic Feats
A cleric spontaneously casting a cure or inflict spell can cast a metamagic version of it instead. Extra time is also required in this case. Casting a 1-action metamagic spell spontaneously is a full-round action, and a spell with a longer casting time takes an extra full-round action to cast.