How long can preamp tubes last?


Good evening Ladies and Gents
Trying to learn! I have had a Shiit Freya + preamp for about 1 year now, and it has about 450 hours of play time, with original tubes.
Is it time to change the tubs? What tubes/brand would be recommended to purchase? 
As far as budget, I really have no idea what they cost.
Also, what does the expression" rolling the tubes" means?

Any information would be welcome.
Thank for reading.
rockanroller
AudioResearch tube preamp tubes don't last that much as well as Sonic Frontiers to the best of my knowledge. 

AudioResearch tube preamp tubes don’t last that much as well as Sonic Frontiers to the best of my knowledge.


but then again, audio research as a company lasts much much longer than sonic frontiers... 😆😆
Depends on particular type of the tube! Military grade vintage tube last much longer.