Astro battery lasts 2 days

Recently replaced ignition switch. The digital clock in the radio stays on all the time. I can't remember if it was on before. If we drive it every day, it is OK, but if we let it set 2 or 3 days the battery is dead. I replaced the battery and checked the adjustment on the switch. Would it be a bad switch? I can't figure this out!

Thanx

go out after dark and check if any interior lights are on. i killed a brand new battery this winter by leaving the courtesy lights on.

...The digital clock in the radio stays on all the time...

The digital clock readout should not be illuminated with the key in the OFF position. Check your adjustment on the ignition switch first.