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Budget can be unlimited if your market is big enough.
Make sure to setup conversion tracking properly before doing this. Pmax needs ~30 signals a day to run effectively. Ideally you get server side tagging, include a detailed ecommerce datalayer and send all add to carts up until revenue.
Whats your profit on the product? Aim for ROAS of above 1 in the first 14 days to see if you can scale it.
Maybe 14×30 to start?
