Determining the right test duration involves several steps. Here's a simplified approach:
Set Clear Objectives: Define what you aim to achieve with the test, whether it's improving open rates, click-through rates, or conversion rates. Calculate Sample Size: Use sample size calculators to determine how many recipients you need to include in your test to achieve statistically significant results. Monitor Initial Results: Start with a shorter test duration and monitor the initial results. If the data shows a clear trend early on, you may not need to extend the test. Adjust Based on Performance: If initial results are inconclusive, extend the test duration incrementally until you achieve reliable data.