Wondering how long it usually takes for a package to move from stable-p-u

[Luke Picciau <lpicciau@connexion.com.au>]

I have been tracking this package 
https://tracker.debian.org/pkg/ca-certificates-java for about a month 
because the package version 20170929~deb9u1 which is in stable has a bug 
which is blocking my docker image builds. Version 20170929~deb9u2 should 
fix it but the package has been in stable-p-u for a while now. How long 
usually does it take for a package to move from stable-p-u to stable? 
And is there any way I can install just that one package as the newer 
version on debian stretch without changing the repos to testing for the 
whole OS?