The DS1682 and DS1683 do not perform any clock stretching of the I2C SCL bus. We do not do test or characterization at temperatures of 95C or higher, so we have no data to work from. EEPROM wear-out increases at higher temperature so that will have an effect. Timekeeping will probably continue with degraded accuracy. Event counting will likely work. However, we do not recommend operating outside of the data sheet temperature range.