Final answer:
For tire repairs, a liberal coat of cement should dry for 10-15 minutes under normal conditions and for 20-30 minutes in cold weather to ensure proper adhesion.
Step-by-step explanation:
When repairing a tire, applying a liberal coat of cement to the cleaned surface is a standard procedure. The recommended drying time for the cement varies based on temperature conditions. Under regular conditions, the cement should set and dry for a minimum of 10-15 minutes. However, in cold weather, the drying time should be extended to ensure proper adhesion. In such colder conditions, it's advisable to let the cement dry for a minimum of 20-30 minutes. These time frames ensure that the cement has set appropriately before proceeding with the next steps in the tire repair process.