How to extend the life of their daily driver?

[maxhifi]

At 6 hours a day, that's fairly heavy use at 2000 hrs a year. I'd expect 15-20 years out of it at that rate before the CRT is spent. Just use it and keep your eyes open for a replacement to store in the garage on standby until the time comes. Keeping brightness down is key to longevity too, that's a great move.