Extra curricular positions are not required to be posted for a specific amount of time. It's up to each individual school district. Positions that require certification such as teacher, principal, central office administrators, etc. have to be posted for 15 days.
I truly doubt any public school district has $40 million-$80 million laying around . As stated by @Big Mck Bearcat, a nickel tax and bonding funds can't be used for athletics. Unless someone donates a mass fortune, no major updates will occur.