[Feature Request] After 20 keys, wait for X hours before continue process

[Dabu-dot]

Steam only allow 20 attempts per hour.

It would be a neat feature to pause the process for X hours after 20 attempts (or even better: when Steam respond with a time-out), remember the position in the array of keys to check and restart the whole process starting by the last time-out.

Thanks for your work in any ways.