That is a great initiative, isn't it? Right up my alley! You can post it on Monday, but it will get more traffic if you do it on a Saturday or Thursday, but you are welcome to do it on Monday. Sometimes it is hard to guess the perfect time to post something. Or at least for me.
Two parts are fine. Many do that and it works well if the posts are linked together. I like when they are big and done in two parts. I think you get to enjoy each of them fully that way.
Whatever you decide will be fine. Thanks for stopping by and leaving your words.
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Thanks!