I just kegged my first beer last Wednesday night, set it and forgot it...until I got antsy Saturday night. Tried to pour a lil out but it only trickled out, determined I might have clogged it with the messy hop yeast trub. So I put the gas on the dip tube side and blew that out. Poured another and it was a little flat, but Monday it was pretty well carbed. Not 100% there but very drinkable.
I think the CO2 bubbling up from the bottom helped speed the process instead of the CO2 just chilling at the top.