O/H has 2 lumps on testicle. How long is wait for ultrasound

Hey. My husband has found 2 small hard lumps on his right testicle. The doctor said it could be a cyst but has referred him for a ultrasound scan. When he went to the doctors he only felt one but he has now found the second. They are both very small but hard. Could people share the experiences and how long we are likely to be waiting. He also experienced a bit of pain last week that lasted a day or two then went.