Discretionary Professional Service Days. Sixty (60) on-site days per year for Xxxx Professional Services (trainers, project managers, and technical consultants). Days do not roll over from one year to the next, unless mutually agreed on. Failure to use allotted Professional Services Days will not result in a discount or refund of any part of the fee owing hereunder. Professional Service Days cannot be exchanged for HVS or third party equipment, software, support, maintenance fees, service days, or any other good or service. Professional Services Days are in addition to and are not the same as Engineering Services time. Days used over the allotted 60 per year will be billed at Xxxx’x then prevailing Professional Services rates, less 40%.