However, I was wondering how long do you usually test price points to get a good gauge from customers? 1 week? 2 weeks? etc?
If you have enough customers and orders you can have valid data after two days. If you only have one customer a day in average you won't have valid data in six month.
It is not so much the time, it is more the number of customers that count. That's what makes it so hard for small business to do A/B testing or get any statistical valid data. If you have 5000 customers on average a day you can measure an increase or decrease of 5% over a few days. If you only have 10 customers per day - not so much.