County of Santa Clara Extensions. This page tells you about what to do if you need more time to take care of your ticket.COVID19 vaccines are now available for individuals ages 6 months and older, and free testing and treatment options are available. Estimating extension times for LA PCR. The annealing temperature, extension time, and primer concentration of the traditional PCR were optimized. Extension requests must be submitted prior to expiration date. What is the recommended extension time for PCRBIO Ultra Polymerase? The extension time is set depending on the expected length of the amplified fragment.