Web lockup with Data entry

I have a list of about 2400 Contacts that includes the school district where that contact person works. I need to have a correct work email added and confirm the correct name of the school district or school site for each contact person on the list. The data entry has been started so all that is needed is to complete data for columns M and N (with N's data in column C already, it just needs to be confirmed. I would also like a completion ETA as I would like the data completed.