Here's a quote that most elders here will remember from KM schools:
"The degree of discipline should be commensurate with the degree of deviation."
In congos I've seen in Northern California that translates to what several have already stated.
3 months minimum (and very rare).
6 months-1 year is typical for run of the mill porneia.
Sky's the limit if you were an elder who was repeatedly deceitful with the BOE.
A local BOE let a DFed former elder hang out to dry for SEVEN YEARS before they finally let him back in.
The former elder had numerous affairs on his JW wife and lied about it for years. Hence, the seven year smack down.
om