Working on Friday Afternoon
Working Friday Afternoon
One should not work on Friday afternoon past the time for Mincha. It is debated whether this means 6.5 halachic hours after sunrise (Mincha Gedola) or 9.5 halachic hours after sunrise (Mincha Ketana). The reason is debated as well; One opinion holds that it's because we want to prevent one from transgressing the laws of Shabbos if he runs too late, and the other opinion says the reason is to leave time to prepare for Shabbos. While there are various leniencies (mentioned below), a G-d fearing person should do his best to abide by this Law. One who unrightfully does not abide by this law will not gain from the work that he does after the time for Mincha.
Leaving with Time to Prepare for Shabbat
Others are Preparing for Shabbos
Some say that if others are taking care of the Shabbos preparations, one is allowed to work past the time for Mincha. There are those who say that this leniency does not apply past Mincha Ketana (even if other leniencies do).
Lenient Opinions
Salaried Workers
Some hold that the Law of not being able to work past the time for Mincha on Friday afternoon only applies to bosses, but employees (salaried workers who do not have flexibility with their hours) can continue working past the time for Mincha.