Is it possible to configure the interval at which bids are sent after the scanner finds a suitable job post?

You cannot specify the interval at which bids should be sent. This process happens automatically.
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All bids are sent randomly within the interval of 5 to 15 minutes after the job post is published on Upwork and identified by the scanner. This is done in order to simulate the actions of a person as closely as possible and to prevent raising any suspicion from Upwork.