5 week old feeding for less time?

[saranga]

My 5 week old was feeding for 30-40 minutes at a time, but in the last couple of days has been feeding for just 20 minutes at the breast, with cluster feeds all evening.
Is this reduction in normal feeding times OK? Is he just getting better at taking the milk out?

If your baby is otherwise fine, then this is perfectly normal and well within normal and even usual experience :)

It tends to happen when babies get efficient and mothers get efficient at letting down the milk - so you're both working together more speedily than before.

Time at the breast does not ever equal or even correlate to volume of milk taken.

You are doing great, from what you say here :)