Rank drop due to inactivity

How much will my rank drop if, lets say, i stop playing for a while (6 months or so) ? Right now I'm just plat 5, and i'm playing 2 ranked games per month to keep ranking but. It started to become more of a chore than anything else. So, assuming I won't play ranked anymore, how much will it decay?

Its not like I can't make plat again, but meh, I don't want to grind 50-100 more games to get back there again.