In dealer terms I don't know, but the service intervals and what are involved are in the owner's manual and shop manual. The more important ones occur at 12 000 km intervals, with valve check and any necessary adjustment every 24 000 km on North American bikes, double that, I believe, on European/U.K. bikes.
My bikes get an oil/filter change at 800 - 1000 km and again at 5000 km when they also get the throttle bodies synchronised. I have yet to have a bike on which the throttle bodies were in sync from factory at the 5k check.
After that they get another oil/filter change at 12 000 km and roughly every 8 000 km thereafter. I stick pretty rigorously to the 24k valve check as there have always been clearances near the low end of spec. at the first check so they get shim changes which gives me a base line for the 48 k check. I check throttle body sync. after every valve check.
Cables, switches and pivots get a cleaning every winter, as do electrical plugs as necessary. All fluids get changed every two years. The swing arm gets removed, cleaned and greased every two years as does the side stand
Other consumables such as brake pads, chain and sprockets get checked a couple of times a year and replaced as necessary.
Air filter gets cleaned annually and spark plugs are replaced every winter.
Oil and filter changes, air filter cleaning, as well as valve checks are the most important items in terms of engine longevity as far as I am concerned.
Other items could let you down by the side of the road if completely ignored but they aren't so important as far as the longevity of the bike is concerned.
What I do is not gold standard and errs on the side of caution, You will find a range of opinions.
Some people spend more money on their wife than they do on their bike, but that's a personal decision. I look on both as high maintenance lifers. Go figure