years, under a contempt of court charge:

https://www.theguardian.com/technology/2017/mar/23/francis-rawls-philadelphia-police-child-abuse-encryption

He's still in there, so far as I can tell.

If that's your stratagem, if they have enough evidence against you, be prepared for the possibility of spending an indefinite amount of time in jail.

His case is obviously relevant to the US, I'm not sure how things work in other jurisdictions.