Ah, I've left mine any time between an hour and a half and about five hours. Is it simmering? It should simmer not boil.
If you haven't already, strain it now through a sieve. Don't do what I did once and strained it down the sink...! Strain it into a clean saucepan.
Then taste it. What does it taste like? You need to know this.
If you want to reduce it down further, then you can boil it once it's at this stage. I'd sieve it once more if you want to do this, again into a clean pan, so no residue bits around.
Then just poor into a jug and fridge it, or freeze it in batches. It'll set to jelly in the fridge if you've done it well, with the fat on-top. Just scrap that off as you use it and use the lovely jellied gorgeous stock for whatever you like this week.
Remember what it tastes like though (as then you know how salty it is and can adjust accordingly if you are making risotto or something with it this week).
I absolutely ADORE a really good very concentrated stock added to some fried bacon and then some pasta cooked all together. Oh my!