What is the recommended budget and time to run your Performance Max for shop goals campaign?

Performance Max campaigns, especially for shop goals, require sufficient time and budget for Google's machine learning to optimize effectively. A 30-day run time allows the system to gather enough data across various signals and placements to learn and improve performance. A $500 daily budget provides ample spend for the algorithm to explore different conversion paths and reach a broad audience, accelerating the learning phase and leading to more accurate optimizations. Running for only 10 days or with a smaller budget like $250 daily would likely result in insufficient data for the algorithm to fully optimize, leading to suboptimal campaign performance and less accurate results.