def is_fee_estimates_update_required(self):
        """Checks time since last requested and updated fee estimates.
        Returns True if an update should be requested.
        """
        now = time.time()
        return now - self.last_time_fee_estimates_requested > 60
Checks time since last requested and updated fee estimates.
        Returns True if an update should be requested.
        
electrum/network.py