I do this in my spare time, and the production rate is about one card per week. Unfortunately this means pretty long wait times and queues. In order to be able to manage the demand, I separate orders and potential orders as follows:
I try to keep the commissions queue limited at 2-3 months, while the wait list is several times larger.
I currently stopped adding people on the wait list, as it grew too large for me to realistically manage it, but you can subscribe for when spots open up on commissions.sunforgecards.com.
If you want your order as soon as possible, you can pay a flat express fee (see Costs). I will make your card as soon as I receive the materials and ship it immediately after that.