In video production, the time it takes to produce a video mostly depends on the amount of pre-production and post-production.
For pre-production, how much planning, writing and coordinating is there? A live event video will require a lot less planning than a scripted commercial or educational video. The more complex the planning, the longer it will take.
For post-production, how many shots are being cut together and how much polish is needed for the finished video? If you’re producing a simple, in-studio testimonial, it can be edited in a week or less, depending on the workload. If you’re producing a high-end video with tons of action shots, motion graphics, and audio mixing, it may be a month or more before delivery.
So, anywhere from a week to a couple of months.