Frequency of bike servicing

What is the usual frequency for servicing a bike? I have been back cycling for about 9 months and have not taken my bike for a service yet, also the suspension fork, how often si that usually serviced, I have ridden I would imagine about 30 hours realistically in the time I have been back riding and my fork was never tuned to my weight and the lockout never worked properly, is it worth going in for a bike and fork service and in London who are acknowledged as reliable for good service, I haven't even lubed the chain or anything since I got it, worried its a bit neglected now!
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Fork service intervals very a lot between manufacturers and models. A Fox float should be serviced every 15 hours according to Fox, new DT Swiss forks are every 200 hours.