Reason: I'm going to be inactive for few months ingame, but I'll visit forums daily and probably IRC too, because I and my family are moving this weekend to a new house, moreover, May and June are the last days of school year, means, I'm going to have some hard regional exams. So I have to leave the game for a while and focus more on real life stuff.
Date from: This weekend, 09/04/2016.
Date until: last days of June. (or maybe early)
Additional note:
I personally don't consider this as a deep inactivity, even if its date is somewhat long, but you'll see me here around everytime. This week I'll not be active, neither in-game, nor forums because I'll not have internet connections.