What is a good target ROAS?

To use Target ROAS bidding, most campaign types need at least 20 conversions in the past 45 days. … To maximize results and give machine learning algorithms enough data to make informed bidding decisions, we recommend that you have at least 50 conversions in the past 30 days.

For More Information Please Refer:
https://support.google.com/google-ads/answer/6268637?hl=en
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