This question needs at least two more qualifying pieces of information. One where do you ride, like if you ride in the dirt on a mountain bike, and the dreaded how do you lube and maintain your chain.
As I have posted before, I ride my recumbent only on hard surface roads or trail. I lube my chain with Mobile 1 and wipe the chain down before every ride. Checking with both a chain wear tool and a steel rule, I get right at 8000 miles on my chains.