Teemo's Invis taking longer than 2 seconds

Guys, I'm new to boards so I don't know if this has already been discussed but does it seem like Teemo's passive takes longer than 2 seconds to activate? I feel like it's 2.5 seconds, and sometimes it feel even longer. I timed it a few times, and got more than 2 seconds according to the ticker in game. Has anyone else noticed this?