Universal Paperclips is a fantastic answer to your concerns, as others have mentioned. It has an endpoint that takes 1-3 days to reach, and hardly makes for an

Universal Paperclips is a fantastic answer to your concerns, as others have mentioned. It has an endpoint that takes 1-3 days to reach, and hardly makes for any idling, there are always significant upgrades to buy at intervals that are usually not more than a minute.