The length of time it takes to complete the foster parent pre-service training is very dependent upon the attendance level of the foster parents themselves, and the work vs. training schedule developed. Missed trainings must be made up/completed = longer time till completion.
On average, 45-90 days is a fair expectancy for the complete training to be completed. That being said, a family that can meet often, gets their background check accomplished early (agency pays for it), and completes their paperwork in a timely manner, can be trained in about a month.