How long is it Destroy All Humans?

I'm curious to know, "How long does it take to complete Destroy All Humans?" As a gamer, I'm always looking for a good balance of gameplay length and quality. I'm interested in knowing if this game provides enough content to keep me engaged for an extended period of time or if it's a shorter experience that I can quickly breeze through. I'd also like to know if there are any factors that could impact the overall length of the game, such as difficulty settings or side quests. Can you provide any insights into the estimated length of this game?