How many activities with code, cost, & resources can you schedule per day? 25?

I am thinking that is how many per day, estimating 25.  To just revised and update 50-75.  I was trying to figure out how long it should take to fully schedule a 100 million dollar facility with access roads.  Say 15 pages, 50 activities per page, to 750 activities = 30 Days.  That sounds agressive, how about 2 schedulers 20 days if they are both good at particular aspects, and then another 10 days fine tuning.  So alone = 3 months?  too much?  I think we all seem to be a bit optimistic when looking in theory...(By resources I mean bare minimum, man days only, - you know why)  Your opinion?  (no this is not a job I'm bidding)  I think the huge difference is if you have a similar template or not, we will assume a template - but one that does not apply very well for this exercise...