Yes if you taste a sample out of the fermenter after lets say 5 to 7 days you will taste a sharp off flavor = green, kinda like a un ripe orange taste.
You will know it when you taste a very young beer and then let that same beer age and that flavor will be gone and the beer will smooth out and taste good.
Oh ok. I was going to let it sit three weeks anyway so, not anticipating any major off flavors. The yeast was VERY busy last night. The airlock was making a lot of noise while was watching TV last night lol.