I will explain some more.
When doing this, you get small punctures which seal with sealant. When you do have a large puncture and need a puncture repair, you take the tube out and inflate it to see where the leak is. The tube stretches, and the small holes which have sealed with sealant leak. So instead of patching one just puncture, I have patched several of the larger punctures. I have left the very small ones to seal again with sealant.
I replaced a tire recently and used the same tube. It took several days to stop leaking. Whenever I have that tube out again, I plan to patch the larger holes.