Think of meditation as exercise for the mind. the more time you spend, the healthier it can be. Although like anything, in excess it can cause problems. Think of an elite athlete. They can be injured or need to retire early or surgeries from over use. Too much meditation can bring a person too far away from their physical reality. Everything in moderation.

I meditate between 1-2 hours a day. Sometimes I will do more and sometimes less. I find it saves me more time that it costs. I get distracted less, I need less sleep and I find myself in the right place at the right time more often. I also have more clarity on what is important so the time I have, I use wisely.