what is the longest time on record after, doing a factory reset on nintendo switch before starting a new system

There isn't a specific record for the longest time someone has waited to start a new Nintendo Switch after performing a factory reset. Users typically reset their devices for various reasons, such as troubleshooting or preparing to sell the device. The time between a factory reset and the next use would depend on individual circumstances, such as personal preferences or responsibilities. If you meant something else, please provide more details!