Why doesn’t the FED just have a one month 6% increase in rates only and then back?

I’m sure it’s obvious. But curious why couldn’t there fed now that it sees like 6-8% inflation, have their rate increase only by one month only. Everyone knows and not much buying/investment/loans etc happen for that month essentially bringing down the hot economy?

If not a month, how about half a month or for a week. Etc