That is determined not by your crunching numbers but by the number of posts you initiate.

241 / 4 = 60.25 days based on your average.

Sekerob's chart says 31 days.

I hope your average is the more accurate number as I want to get my sapphire badge. :)

My comment "averaging about 4 batches per day" is purely from my own observations. For example, on 25 Nov soon after the project re-start, parent batch 2107 was reported, and now on 27 Dec we have parent batch 2233 reported, a throughput of 126 batches. Between those two there are 32 days, so this simple calculation gives 3.93 batches per day. I've been noting the most recent parent batch numbers daily around 8am GMT when reported or downloaded by me, and a linear trend line through those gives 4.05 per day at present. There are daily variations around that line, such as your "7 in slightly over 24 hours", but a linear trend looks reasonable overall so far.
It's a fair comment by spingadus[MM] that a continuation of that trend gives 60 days (from yesterday) of more parents. However, we're not taking the varying size of each batch into account (the "number of positions" in the researchers' chart), although by eye the future average size seems similar to that of the past month; nor the varying difficulty of calculating those positions; nor changing behaviour by crunchers - will more jump on board even now to catch a badge, or do more leave having achieved a badge?
I'll be interested to hear whether SekeRob has used any additional information and/or past experience of project completions to refine his own estimate!

I was wondering when that was going to clear up. I was looking at the percentage advance per day, and running some numbers... At 0.15% per day, there was no way we could complete the remaining 10.78% in 30 days.

Even now, those numbers say we should be looking at closer to 70 days remaining. Of course, I don't have as clear a view as Sekerob does, and there's lots of slop as people jump on the bandwagon to clear the project and grab any remaining badges. Still, I figured we had way more than 30 days remaining, so the apparent "jump" on the dashboard didn't take me by surprise.

Sekerob's dashboard this morning is now showing 59 days left (0.13% per day) and the latest that I have crunched was a 2233 parent.

Gotta keep crunching....

CJSL

PS: Just to let you know I finally made it to gold (which is more than I had hoped for). I will be moving off this project and pursuing other badges on other projects. Lots of luck to everybody in reaching your milestones.