The typical time is 6 weeks, it peaks at 10 weeks and tapers off til 12 weeks which is when the "honeymoon" trimester begins. The reason is because at 6 weeks-10 weeks, your body produces loads of hormones that make most people sick and at 10 weeks, baby can produce it's own hormones.
I am 15 weeks and for the most part, this was how it went for me. However, the sickness came back at 13 weeks

so much for my honeymoon trimester... Also, I started to have fatigue and body aches as early as 4 weeks. If anyone days they had morning sickness the day after conceiving, I'd question it... Your body isn't producing any pregnancy hormones that early which is what gives u morning sickness