I took this paper:
http://arxiv.org/abs/1204.2795
hep-ph/string-pheno/m-pheno/m-pheno-higgs-mass
Looks ok...
I took about one minute to categorise this, and this categorises not just this, but actually 7. This is less than average, which I will say to be 10.
There are about 900000 physics articles on the arxiv, so that will take 90000 human-minutes. If even 10 people volunteer (very unlikely that so many would though, e.g.Lubos Motl was once quite bemused when Dilaton suggested that he retag about 400 questions from TP.SE which were migrated to P.SE), that would be 9000 minutes per human.
... which translates to 150 hours straight, or an entire week without sleep, food, or water : )
To "devote a weekend" would mean categorising at the rate of about almost one paper in less than 4 seconds.
Do you think it is practical for 10 people to not eat or sleep or drink water for a week? Definitely not with the current dry climate like that where I live : )