I never get them immediately after logging in, but sometimes within 15 minutes or so. It's probably just a coincidence. If you're botting for nearly the same amount of time and getting nearly the same XP rates for each session, it would make sense that the randoms happen at nearly the same usual time. In your case, when you log in.
Long ago, the '90s Nicktoons lived together in harmony. Then, everything changed when the century turned. Only Avatar, the best of the 2000's Nicktoons, could save them. But when the channel needed it most, the show finished. Four years passed and Mike and Bryan created the new Avatar: Legend of Korra. And although the show itself is great, it has a long way to go before it can live up to The Last Airbender. But I believe Korra can save Nickelodeon.