It is important to note that disasters can threaten lives months BEFORE dec 21 2019. So if you think preparing a month before is OK, it’s not. Society probably will break down earlier than that. My prediction is October at the latest you will see widespread damage.

Time is running out at increasing, not a constant speed. So if you plan 1 month to get ready, in reality you’ll only have like 2 weeks. Imagine two ppl counting to 100 for you to hide. One counts slower and the other counts faster. That’s what’s going on. Buying stuff, sealing them with rubber, making a detailed plan, all of it takes time.