Seconded, this was my reason for suggesting one a day. I believe there are over 800 articles, so even at one a day that'll take a few years! [Edit: Correction, it seems there will be about 300 articles - see link below.]
Once a day was pretty much the original pace as well.
I was originally for a pace of two per week, just knowing my own work schedule. But if there are truly going to be 800 articles represented in the book, then one a day is the only workable solution. Do we know that the book will be broken out into something like 800 articles?
The book version of the Sequences is supposed to be published in the next month or two, if I understand correctly. I would really enjoy an online reading group to go through the book together.
Reasons for a reading group: