If you choose an ad-hoc contract, you will be billed on the last day of each month.  A deposit may be required should you go over 5 hours.  With this option there is no minimum contract and no notice period. If you choose a retainer package, you pay a reduced fee in advance so that we can block out the time and be available when you need us.  All retainer packages come with minimum monthly hours and a 3-month notice period. We bill by the minute and time track every project.  If it takes 17 minutes to complete a project, you will be billed for 17 minutes. So you will only ever pay for the time that we use. No rounding up to the nearest hour here. A copy of this report will always be available on request.