Perfectly normal, even if you look after your chain, they'll wear out in the end.
I only do around 2,000 miles per year but change my chain each spring. It gets muddy, gritty, wet all through the winter so having a nice new chain in the spring going through summer and autumn is nice.
I only do around 2,000 miles per year but change my chain each spring. It gets muddy, gritty, wet all through the winter so having a nice new chain in the spring going through summer and autumn is nice.