What actually IS the warm-up period?

Since we use your current Google Merchant Center account, we don't have a warm-up from Google. With that said, our AI logic still needs to warm up by testing different bids until it finds the sweet spot where we reach or go above the ROAS target and also meet the conversion value goals. The AI warm-up usually takes 1-3 weeks and that is why we offer a 30 days trial period free of charge.