So there are several things to look for in a transition. Hot spots is one (5 -10 days is good to start). The other things you want to consider are dialing in a campaign for at least 30 days. If you have the time and resources, 60 - 90 days is even better. 30 days will do though. Be aware that with only 30 days of optimizing and scaling, you'll need to continue dialing in all your campaigns as you go. Later on 90+ days it will be less hands on and more copy/paste.
Also, check your PTR. Make sure you're above 50%. The higher the better.