HDMI question.

Was asked this question by a family member:

Is it okay/safe to leave the 'TV side' of the HDMI cable plugged in to the TV ? (Quite cumbersome to plug in every time).

If it matters the TV is a 2007 Panasonic (Plasma) and the laptop is a Vostro 3560/Win7-64/Intel 4000.

Also, I read that long HDMI use is hard on plasma TVs especially older ones (ie pixel burnout). Is this true and what would be a safe amount of time if this is true ? Opinions appreciated.