2 weeks is the norm where I work. I took three as there was so much to sort out. The bastards made me take a weeks holiday, I just took a week off sick later in the year to get this time back.
Other people take the two weeks then go see the GP and get another week or two signed off so no one can question their time off, usual symptoms are not sleeping, anxious about remaining family, can’t concentrate and the obvious still stunning and in shock and therefore useless at work.
What I would say is don’t rush back,