Hi there,

I'm not a physician but we always suggest not to over do the practice since injuries can occur. If you rest a little bit and stretch your fingers / hand, you will most likely be able to practice once again soon! But for the future, I recommend practicing no longer than 1 hour. And again, it's not about length, it's about consistancy. So give it a few days and when you're feeling 100%, keep the practices short and precise.

Best,

Billy