Maintenance and optimizations are performed a minimum of once a week. When we implement changes to a campaign, those changes will need time to run before we can judge their performance. Be aware that changes early on in a campaign will reset the learning phase and it's as if the ads started running from scratch when those changes are made. Please note that we need to give ads time to perform. Sometimes campaigns perform outright, but other times they can take a bit of time to hit a good stride. This is especially true for accounts that have never advertised before.