Your staffing level depends upon the cleaning specifications and frequencies and individual factors that affect production rates. In addition, a church usually encounters chair set ups as well as after hour weddings/meetings. So, it is difficult to expect a national standard to apply to all churches.
In your case, if your custodians cleaned at 3,600 square feet per hour (a normal production rate), it would take 59.44 hours each time to clean your complete facility. With a seven hour shift ... — Gary Clipperton - National Pro Clean Corp.