Jet wash top, sides and bottom of chain when washing the bike... along with chain guides.. while spinning the rear wheel with the bike on a stand.
When putting it away after the engine warm up following a wash I WD40 the chain.. then a quick spray with off road chain lube...
When you get it out again for the next ride, a good spray with off road chain lube again...
Usually get through two fronts and one rear sprocket out of a new chain ... a good 200+ mile ride every week.. sometimes more..
At the lunch stop on a long ride or half way through a fun day/enduro I poke out the mud around the front sprocket and give the chain a blast with the piggy back small chain lube can that fills up from the big one
A large can of Motorex off road chain lube will last 6 months..cost about £5 each..
An O ring chain will last a good 12 months
An X ring will last 18 months and the front sprocket will last the life of the chain..
I keep the previous chain as a spare in a sealed bag of old oil until the next change..
MOST IMPORTANT thing to get right for a long lasting chain AND sprockets is to make certain the chain run between the front and rear sprockets is straight... dont bother with the chain adjuster marks on the swing arm on a bike thats been used, especially after an off, as they will quickly go off true...
Check by taking off the chain and using a straight edge, flat on the side of the rear sprocket running to the front sprocket..it should be flat on both of them...
When you have aligned them up your chain will last longer..
To keep them aligned I check the straightness at least once a month and I have put a small drilled dimple in the flat of one side of the adjustment bolt head and a small slot in the oppersite flat. (Do this for both).. Then when I have to adjust the chain tightness (not as often as I used to) I do it by half turns of the adjustment nuts/bolts using the dimple and oppersite flats as an accurate guide to keep both sides straight...
It really does work well...
I also check the chain guides, especially the one under the swing arm by the rear sprocket. As soon as it gets a bash it will rub one side of the chain and wear out your split link clip and rivets heads as they are slightly proud of the rest of the chain..hence the finger cutting sharpness you get sometimes..
