Most conventional computer monitors last between 8 and 15 years, although how long it will last will also depend on how often you use your monitor as well as if you’re careful not to damage it, which can be a challenge for mobile devices. And although portable monitors are newer to the market, which means there’s not as much historical data on reliability as there is with conventional models, it appears that preliminary estimates put the lifespan of portable monitors around that same time frame–8 to 15 years.