BFAD has recently computerized their operations, and so, you will not have to go to their office to fill up forms. Their website claims that it will take only a few weeks to get the full LTO, but in the end, it will really depend on how fast they can send their representative to inspect your facility. Typically, this will take anywhere between 2 weeks to 9 months. You will need to constantly follow this up so that action can be made.
If you are not familiar with the BFAD requirements for pharma, you may need to hire someone to help you, specially in the planning stages so that you can minimize the necessary costly changes and help you with the documentary requirements for GMP, Traceability, etc.