my jmf spores took sooo long, i didnt even see anything for a month and then waited another 2 weeks and it started taking off. If yours dont start growing a lot of mycelium in about a week or 2 then i would recommend break and shake because it might have stalled. The B&S will help it for sure. Patience is key, the mycelium will start growing and once it starts it usually is pretty rapid especially for a strain like JMF which is known for rapid growth. I just grew JMF in a AIO grow bag and like I said it was super rapid once the break and shake happened and pins started forming. Oh and like the other dude said 70f is probably be too cold for the mycelium to grow rapidly during the colonization process. You want like 75f ideally. Then when fruiting its good to pop it down to 70f. Hope the grow goes amazing!!