Showing the house I am renting

My two year lease is up in 5 months.  The owners of the property have decided they want to sell the house.  The have advised me that they are putting the house on the market this month.  I am not comfortable having strangers in and out of my house over the next 5 months.  Is this request unreasonable.  My lease agreement states that they have the right to enter or show the property with a 24 hour notice.  This was intended for the next leasee and I understood that a few weeks before or even a month before the end of the lease this may happen.  Can they infringe on my privacy for almost 1/4 of the lease?