Learn how to unlatch your baby from the breast without getting hurt.
This is a useful tool in case you need to interrupt the feeding for any reason, like a sudden emergency or in order to correct the latch or if your baby becomes too passive at the breast and needs to be woken up - You can see how passive feeding looks like here: Breastfeeding Baby - Less Active Milk Transfer.
The mother in this video is unlatching her baby because feeding was painful due to a shallow latch. In such circumstances it is recommended to unlatch the baby and attempt a deeper, asymmetric latch - Read more about deep latch here: How to latch your baby to the breast.
It is not advised to unlatch a baby who is still showing signs of interest in the breast, just because the duration of the feeding appears too long. Nevertheless, if the baby seems to suckle too passively or in case the latching causes you discomfort, you may unlatch and latch again.