My services start at $50 + GST per hour. That's $57.50 per hour including GST. This is non-negotiable.
The number of hours will depend on the complexity of the work involved.
A simple payroll run with 1-10 employees, each on fixed hours per week may only involve a couple of hours of work a week once the system is set up.
A full software setup and implementation for a more complex organisation or business may involve weeks of work.
Basic bank statement reconciliations may only require 2-3 hours per month. It really depends on how big your business or organisation is, and if there are a large number of transactions to reconcile.