We boarded the boat at 10.30am, it departed around 11am. We were the only clients. We saw other boats, some were crowed with groups, others with 2 or 4 people only.
After 1 hour on the river, we stopped by a 'fish shack' where we had the opportunity to buy fresh fish/prawns/crabs to be cooked on-board.
Around 1pm, we anchored and the staff served us lunch (traditional Kerala lunch with multiple dishes + the fish we had bought).
The boat-ride finished by 2.30pm.