If your a home brewers and in a rush to carbonate your keg this is the best method I have used that works if you’re in a rush
I used to apply 40psi for about 12 hours and then drop to 25psi for another 12 hours. Then reduce to serving pressure. Great results
But If your in a a rush the shaking methods I have used have been average and resulted in over carbonated beers.
This methods takes about 3 1/2 minutes and gets you to about 85% carbonation - very drinkable. Then reduce to serving pressure and you should be fine the next day or so.
Hook up to 40psi and gently roll the keg on your knees for 3 1/2 mins. Burp and serve