i do 30 min batches as the water gets warm , adding cold water and doing another 30 min , yes done that many times , i would say 2 hrs as it seems to darken considerably after that (joose)
@Zeki Hilmi , when i get a new joose , it gets a swizz with my coffee frother and then 30mins in the untra sonic , that generally takes a joose to a good steep level ..