How much time should a guy wait to masturbate after varicocele embolization?

Until he's alone: This would be a great time to use a lot of lube and an extremely light touch, with good support for your scrotum. Any other questions, ask your physician. Best wishes.

Soon after feeling..: You may masturbate as soon as you feel comfortable with no undue pain/ache/swelling at/near the surgical site. In fact, there has been no strict time table to restrict postoperative physical activity but heavy lifting for 2-3 months (that is even optional. ) largely, most of postop advice/restriction is designed to serve demand of political correctness, medicolegality...; let common sense rule.