add voice to ppts - repost

Hello, I have some ppts which need to add voice i will provide transcript and what u need to do is read it [it should be understandable to those who are not native speakers , like indians]. For that i will send one ms word page which has around 500 word to selected freelancers [not all], record it and send it to me. thanks. I am creating this as hourly project as I can't give exact time and effort u will need to put. thanks. Note : we need to complete in 2 weeks time, and there is around 50 ppts with total audio length around 600 mins.