How long should you typically allow an A/B test for bidding strategies?

• A. One week
• B. Four to six weeks
• C. Two to three weeks
• D. Eight to ten weeks

Answer: (B)

Setting the right duration for an A/B test of bidding strategies is about collecting enough data to see real performance differences rather than random noise. Four to six weeks is typically used because it covers multiple weekly cycles, including weekends and varying traffic patterns, so you get a stable view of how each bidding approach performs over time. It also gives enough conversions and impressions to establish statistical significance for key metrics like cost per acquisition, return on ad spend, and overall conversions. If you run the test too short, results can be skewed by day-of-week effects or unusual spikes; run it too long and you risk wasting time without additional insight. While very high-traffic accounts might reach significance faster, the standard practice is to run for about four to six weeks to balance reliability with efficiency.