Can a hit of weed show up in a drug test in over 24 hours?

It depends on how often you smoke in general. Say you smoke every day of the week for a month....then you smoke before the test; then yes it will show up. But, if you never smoke and have a hit or two a few days before your test you should be fine as long as you drink a bunch of water and eat clean. Personally, I smoked a day before a test and passed, but hadn't smoked before than since a few months before.