My question involves court procedures for the state of: Michigan

I'm not sure how to word this, so forgive me. When the opposing side is planning on using evidence to support their case (i.e. documents, photos, etc), they are required to provide copies to the other side, correct? Do they have to do it within a certain time frame before the hearing?

I am the plaintiff in a case and the defendant's side claims to have recorded phone conversations, emails, etc. My attorney has requested copies of all of it so that we can review it to further present our case, yet the opposing attorney has not yet sent it to us. We have requested the info twice and have still not received it. It has been 8 days since the initial request, and the hearing is in less than two weeks. How long is the opposing attorney allowed to drag his feet in getting this information to us???