I have Calls and they are out daily now. They are almost 4 weeks . They swim all day and are outside to begin Being Ducks..
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Mine were about 3 weeks when I took their heat lamp away during the day and then turned it back on in the evening. I think just one week after that I left it off all day long. Ducklings grow fast and don't need as much heat as chicks. Your brooder looks smaller than mine - so I bet they will be warm enough for half a day with no heat lamp. When it is on, do they have space to get away from the heat? Also, do you monitor the temp? You could always move the heat lamp further away to make it cooler while it is on.