If it's the new specification then ( like the others) it's going to be a bit of a shot in the dark ( but that's another whole discussion....).
There is a thread further back about Food Tech and the amount of work involved that might help.
Generally speaking the advantage of these type of assessments is for those students who don't like the pressure of exams. The downside is that to get high marks can be time consuming. However the independent learning aspect can be a good experience.
If your DC doesn't enjoy the subject area then she is going to find it a slog and if she is academic rather than practical then there are probably options that she will find 'easier'.
To answer your specific question
the consensus from various previous threads seems to be that Art is the most time consuming of the 'practical' subjects so it's unlikely to be as much as that.