I force carb my kegs, as most do.
This means instead of adding sugar for the yeast to produce CO2, you just add the CO2 under pressure.
Not having to 'referment in bottle' you can have it in the fridge from the get go, in fact, force carbonating a keg works better cold.
But I find that the taste improves after 2 weeks under pressure, even though it may be carbed earlier.