Awesome, thanks guys! Going to try this , & InkBots suggestion right now.
EDIT: Emoaeden, that's pretty much what I was trying to figure out. Thank you for sharing that, looking at it in the Event Editor is a major help.
What would I add to make that Toggle occur only once? Also, I'd like it to happen at different times with different instances of the same sprite.
I know that I could just clone the sprite for each time I want it to happen, and add that System - Every X Seconds - Sprite - Toggle Bonus event, but wouldn't that bog the game down? Could I just use Instance Variables somehow, and add an event for each sprite with a unique IV?
I can't thank you all enough for your input, it seems this forum is full of smart/helpful people.
EDIT: I forgot to mention I'm using an HHMMSS counter counting up from Zero. Used the tutorial here (http://www.scirra.com/tutorials/173/time-counter/page-1).