While on the Nerdist Podcast, with host Chris Hardwick, James Hetfield mentioned that they have tour dates scheduled for the whole year but are limiting performances to 50 a year. That sounds like a lot to me.
Loudwire.com has more details and an audio clip from the show below. 

Metallica’s James Hetfield: My Body Can Only Handle 50 Shows a Year

Via loudwire.com