While I'm no expert I have done some research while contemplating my cam change last year. A hydraulic roller lifter would last a very long time because of two key features it has constant contact with the cam lobe and they require low spring pressures to operate. These factors will allow the lifter to go 100,000 miles with fresh clean lubrication. Once again not an expert but a master tech with almost 40 years in the business and I have seen many hydraulic roller engine run well over 200K
Gus