that depends on a DC, there are various stages of development, as indicated on this site.
plus, you understand, Visitor, that the DCDs are produced in secret location, by a trusted one-man team, and that can take a little time.

there is a growing stock of DCDs ready for dispatch, you get those in about a week. the ones that are being still refined you will get within one (1) month, delivery time can be discussed.

DCDs at earlier stages of development might take longer, you can simply reserve those, you will be kept updated.

most DCs have a part-payment option, should you find that useful or necessary.