200 Watch - ETAs for GMS

the longer you take the average the better the data.

Actually that doesn't hold true with this form of data for two reasons -

1. You tend to kill faster and gain more xp as you gain in levels, so your lower levels from further back in time would drop the average.
   
2. People tend to push harder during events and near a levelup, making more recent data more accurate indication of future progress.
   

That's why I only use a two week period. What you were getting three months ago isn't honestly relevant to your current progress due to the constantly changing variables.

I don't really understand your way of estimating how long it'll take until they hit 200. I know I'll go for 4-5 days gaining less than 10% a day, then spend another two days grinding more than 4 hours on 2x, and level several times. Not everyone is outputting a steady exp gain like a machine.

Also, a column for which class they are would be cool.

Didn't notice the Job column was missing, I've put it back in. (Also random thanks to Fiel for cleanup, for some reason SP randomly truncates my posts every now and then. ).

As for the estimate, keep in mind that your average rate of gain is specific to you, using your own results rather than comparing you to other people. It's quite easy to extrapolate your progress based on how you've been behaving at any given time. Think of it like a cross country driving trip. If you've got 1000 miles to go and drive 80 miles, 100 miles, 120 miles, 50 miles over the course of four days you've traveled 350 out of 1000 miles and can be assumed that if you continue driving at that rate (approximately 88 miles a day) you'll reach your destination in 650/88 days ( your 8th day, because 7.33 means "during the 8th day".