How long can a halo reach credit ban last

A credit ban is unpredictable. They can last for 5 minutes, 30 minutes, an hour, days, weeks, just depending on how much you boosted. If you get the message saying "online credits have been reached" just stop their it's a warning. Continuing on could credit ban you for 1 day(24 hours) to a week if it has happened to you more than once.

If you feel like taking risks after it says "online credits have been reached" their is a neat glitch you can do.( go to sytem settings/console settings/clock/time zone/ go all the way to the bottom/ select it/ start up halo reach/ custom game/ end it/ go back to dashboard and switch it back to your normal time/ start halo reach up again/ and voila there you go) I don't know if this can get you banned because i know people who have boosted from captain all the way up to general's doing this glitch.

I would say their is a pretty slim chance of you getting banned for boosting, Bungie members have other things to worry about such as Mods like aimbots, wall hacks, modded controllers etc. REMEMBER DEPENDING ON HOW MUCH YOU BOOSTED IN THAT CERTAIN PERIOD OF TIME CAN DETERMINE HOW LONG YOU'RE CREDIT BANNED. IT CAN VARRY BETWEEN DAYS TO WEEKS SO BE CAUTIOUS ABOUT HOW MUCH YOU BOOST EACH DAY.