It makes perfect sense from the researchers point of view, which is the one which really counts. An 18 hour job over 7 days is only a little more than 2.5 hours of crunching per day. If this is not satisfactory to anyone, they could just crunch other projects or lower the size of their queue. This process is not supposed to be burdensome to the cruncher.
Cheers

If you limit them to four with an app_config.xml file (placed in the project folder), they will run in 12 hours or less on the 3700X.
This will work:

And limiting them to two will produce run times of less than 11 hours.

If you are not familiar with these files, just create them in Notepad (or any text editor) and use the "save as" function to save them as an ".xml" file. Then you place them in the WCG project folder, and activate them in BOINC via Options -> Read config files, or by rebooting.

Result Name          OS           AVN Status Sent Time         Due / Return Time CPUh  Claimed/Granted
ARP1_0028355_025_1-- Linux Ubuntu 727 Valid   9/18/20 11:11:07  9/18/20 20:15:12  7.32   440.7/507.5
ARP1_0028355_025_0-- Linux Ubuntu 727 Valid   9/18/20 11:06:46  9/19/20 06:14:24 14.08   574.3/507.5

Disappeared…Disappeared…

Result Name          OS           AVN Status Sent Time         Due / Return Time CPUh  Claimed/Granted
ARP1_0004764_025_1-- Linux Debian 727 Valid   9/18/20 13:20:48  9/19/20 10:19:49 15.05   597.1/599.8
ARP1_0004764_025_0-- Linux Ubuntu 727 Valid   9/18/20 13:20:24  9/19/20 17:26:22 26.41   602.4/599.8

--------------------------------------------------------------------------------------[Copied from Workunit Status, generated by wcgformat (using these options: -f -o)]

These links (URLs) aren't everlasting, so if you want others to catch them on time, you'll need to 'textify' them, converting the text on the webpage to livened up text and to paste the result on the forum here, like I did(*).
Just saying…