All webcomics have problem with comic time being slower than real time, some examples available on tvtropes. Obviously, whole EGS which started in 2002 and barely covering more than year of comic time (see the timeline) is good example, but the ration is not linear ... let's list the more interesting examples.
Note that it can actually cause problems, or at least make the Technology progress in EGS look weird ...
Most comic time per real time Edit
First the inverse: most comic time passing in smallest amount of real time is obviously the half year long timeskip done on EGS Main Story Comic for 2013-02-01.
Most real time for comic time Edit
The obvious winner in terms of ratio of real time to comic time is in There be Whales Here 3: The two-thirds of second Tedd was falling took whole week since EGS Main Story Comic for 2013-01-22 to EGS Main Story Comic for 2013-01-28 (5 pages). That is ratio 907200:1.
Notable long days Edit
Tam Eh Tedd runs from EGS Main Story Comic for 2003-08-18 ("A Fun Way To Start The Day") to EGS Main Story Comic for 2003-10-10 ("Important Piece In A Large Puzzle") and Painted Black runs from EGS Main Story Comic for 2003-10-13 to EGS Main Story Comic for 2004-07-05 ("The End"), 164 pages over ten and a half months to cover a day.
Grace's Birthday Party runs from EGS Main Story Comic for 2005-05-23 ("Let’s Get This Matter Out Of The Way, Shall We?") to EGS Main Story Comic for 2006-09-29 ("The End"), 151 pages over 495 days to cover maybe eight hours.
In Squirrel Prophet parts 2 and 3 Grace is on her way to school in EGS Main Story Comic for 2014-04-01, Justin is at the shop later the same day in EGS Main Story Comic for 2014-04-15, later joined by Grace and others, and the characters leave a few hours later at EGS Main Story Comic for 2014-12-30 just to end the day probably not whole hour later on EGS Main Story Comic for 2015-02-11. That's 182 pages over more than ten months covering a day.
So A Date At The Mall run since EGS Main Story Comic for 2015-03-02 to EGS Main Story Comic for 2016-05-16 ("Soon"), 168 pages over forteen and a half months to cover just a few hours and a flashback. Question Mark and the last page of Squirrel Prophet take place on the same day and the following night, making a total of 179 pages.
Sister 3 - Catspaws parts 19 (starting with EGS Main Story Comic for 2017-08-30 to 25 (ending with EGS Main Story Comic for 2018-07-06 take place the same Friday. That's 128 pages over more than ten months covering one day.
Playing With Dolls started EGS:NP Comic for 2014-08-01 and ended at EGS:NP Comic for 2015-01-19 again covering just few hours and being the SAME day as the Date At The Mall (also, Question Mark happened the same day).
Longer periods Edit
Most of Squirrel Prophet (starting with EGS Main Story Comic for 2014-04-01), So a Date at the Mall, Question Mark and most of Sister 3 (ending with EGS Main Story Comic for 2018-07-06) take place between one Friday and the next, 660 pages (not counting Q&A 7) over more than four years covering eight days and two flashbacks.
Title "Last October (Holy crap, this predates Goo!)" on EGS Main Story Comic for 2010-08-18 refers to something happening BEFORE start of comics, which is mentioned in that title, as well as in commentary.
Title "June 7th continues. Again. It will never end." on EGS Main Story Comic for 2012-06-04.
Related weirdness Edit
Sarah's hair growth Edit
Note that technology is not only stuff changing suspiciously fast. There was at least one case where Sarah's hair grown quite long during SINGLE DAY - and note that there was no magic involved like later in Nanase's case around EGS Main Story Comic for 2012-06-11.
The endpoints are EGS Main Story Comic for 2003-05-12 ("Something's Not Quite Right Here..."), start of the double date with Tedd and Grace on Friday, and Sarah's waking up in EGS Main Story Comic for 2003-08-21 ("Me In The Morning") on Saturday. However, the hair was already little longer during date, as seen on EGS Main Story Comic for 2003-06-02 ("Partial Disclosure") ... and the Q&A session, while out of continuity, also seemed to help, see EGS Main Story Comic for 2003-08-06 ("Q&A While I Play").