When you purchase prepaid blocks of 20-hours, they are valid for one (1) year from the date of purchase no matter if you have used them partially or in full.  For example, if you purchased 100-hours on January 1st, 2022 and do not use them for development work on any of your active and ongoing projects until January 1st, 2023, your hours will expire and you can no longer use them. However, if you would like to keep your prepaid hours for future development work, you can rollover them towards next year by contacting us and paying a USD $300 rollover fee within thirty (30) days before expiry.