In hard abrasive rock conditions it is important to use good quality M6 or 21% Manganese liners which are designed specifically for your application.
In addition to this one should clear the arm guards or check that they are clear at the start of each shift. Special attention should be given to the lubrication system checking the condition of the oil and the filters regularly.
When doing liner changes or at regular intervals the bush check dimensions should be measured and the parts replaced as necessary.
Wear on the arm guards,main frame liner etc should also be monitored and replaced when necessary.
A good time to change the liners is when throughput drops by 10% as it doesn't get any better after that.

Wear as such is depends on abrasion index of feed mat. , setting, moisture of feed, choke feed and opitmized liner shape. The rest is a question of price/kilo of Mn % and nothing else.
There are not very much suppliers who understanding the nature of crushing.

Daily review and maintenance has to include the hydraulic systems. All crushers use hydraulics for the control aspects of the machine, but this seems to be the least understood. In the end contamination control, which if monitored and addressed, is part of the daily schedule then machine life is exponentially enhanced. otherwise you are down for weeks, good liners or not.

Simple maintenance tips -- Firstly 'think your car' and do YOU look after your crusher like you look after your car?

-- "Good thought". Check Tires (manganese) by all means for correct cavity design for feed presented.

Then check the lube system (and hydraulics) oil pressure, temperature, flow, level and oil grade and type according to specification "look after the crushers heart"

Then think of the crushers lungs? Check are breathers on tank and crusher for blockages/cleanliness, maintain atmospheric pressure "look after the crushers lungs".

Main frame arms bridging and build up in the discharge chutes, etc, etc, etc.

If I can add to you vehicle analogy, I find most clients don't take into account the feed to the crushers seriously. A car cruising down the highway at a constant speed will drop fuel consumption and the chances of an engine rebuild significantly compared to one racing traffic light to traffic light.

Ensuring that the cone is constantly choke fed (and with correct reductions ratios) significantly increases the effectiveness and reliability of the cone. The power consumption peaks and troughs of a choke fed cone is easily half of an inconsistent feed. As my personal rule of thumb, not having surge protection in front of the cone is at least a 10-15% difference in production.

That coupled to central feed distribution/presentation into the cone crusher, a well graded feed with no more than 15% of feed material smaller than the crushers CSS (reduce briquetting) should do the trick.