Characteristics and Extra time

[Curufea]

I've got a power writeup on a friend's new character that has stumped me as to how to handle it.

It's +30 Strength, with incantation and extra time: full phase. He's also bought it as non-persistant.

He has not, however, bought the extra time as "to activate only".

Does this mean he can only make 0 phase actions until he consciously turns off the additional strength?
Or does it mean he can act normally, unless he uses more than his normal strength and starts using the additional strength?

Making an attack is a half phase action, so with extra time, full phase on STR, what can he do?

[Steve Long]

If the Extra Time applies throughout use, then every Phase the power is active — which means every Phase unless the character consciously turns it off, since it’s Persistent — the character has to spend a Full Phase to keep it active or use it. In other words, he pretty much can’t do anything but use his STR, though he could make Zero Phase Actions or Actions that take no time.