Oil change interval: mileage vs. Time

I own a 1995 Honda Prelude that I barely drive. It is more of a weekend vehicle which I drive maybe once a month. It has Mobile 1 synthetic 5w30 in it now. It has been 9 months and 1600 miles since my last oil change with Mobile 1 synthetic. When should I take it in for another oil change if I barely put in 3000 miles in a year? What is the max life of Mobile 1 synthetic oils or any synthetic oil before they stop providing lubrication? I know that the recommendation is 3 months or 3000 or so miles for oil changes, but what is the reality in my situation. Thank you in advance for your response.