Are you an engineer by profession? lol Time is relative. Depends on how complicated the pattern is, size of the blocks, are you counting the cutting time or just the piecing? How many hours a day are you going to sew? Generally I figure it takes me about an hour for a block that is in the middle (as to difficulty). That doesn't count for any hand sewing or applique. Maybe it you pick a pattern and the fabric we would be able to better help you.
Sue