Listen for baby swallowing. The jaw movement goes past the ears, sometimes making the ears wriggle. The baby may not suck for long on the second side. Start on that side at the next feed. Take the baby off the breast, offer a burp and then latch on again.
All babies are different and take different lengths of time to feed.
If a feed is taking an hour or more, the baby probably is not latched on properly. Contact someone to watch you nurse and check your latch. If you have difficulty feeding your baby in the 'cradle' position, try the 'Football Hold'. A mother who had a Caesarian birth. Mothers with flat nipples.