We had Weimaraners before the golden retriever and never had to have them groomed. Bathing was an adventure with them, though!
The golden needed grooming usually just in the spring/early summer. Maybe twice a year, I really can't remember it has been so long now.
Now I have a bichon. The groomer wants him to come in once a month, but we try to stretch it out to every six weeks. Two months is too long though.
I would really like to take a grooming course.....just so I could do my dog! We pay $60 every six weeks. If we go 8 weeks, it costs $96! And I comb him out every night too!