It depends on the lenght of the sequence, this one is like 6s. It took me around 3-4 days.
You need to be very careful when animating the lip-synch cuz of mouth and face expressions matching what character says.
I would probably have things done quicker [2-3 days?] if I wouldn't work for half a day in the job. I only can work on my stuff once I will be back from it and until midnight ;^;