Whenever possible, try to touch a project only one time.
When an email comes in, try to only open it one time. Open it, deal with it and then file it away.
The alternative is to open the email, move on to the next email, go back to the first email, and waste a lot of time.
If you can touch an item one time, finish what needs to be done and then move on you will find you will be more efficient.
If you don’t have time to address the issue with your first touch, do something that requires less time and then when you have time for the first touch, do it properly and efficiently.
Have a great day!