Speech to text software

Hello,

I am new to this forum, so i apologise if my question does not follow standard procedures.

I am looking in to create a procedure for automating a speech to text application.
Does anyone have any idea of how much work this will take. I have had some machinelearning courses at my university, but i dont think that i have good grasp of the workload it might turn out to be. Have anyone tried doing this? And perhaps succeeded. I am not thinking organizations like google, but individuals who were just strong in programming and machinelearning?

I hope you will find my question exiting and that someone can help me answer my question.

Best regards C00P91