Bees have very good nectar sources. They do one trip per minute. In 10 hours one bee does 60 x 10 = 600 trips.
We have 50 000 foragers and they do 30 milj. trips per day. They may get 5000 g surplus honey per day. How do we calculate teaspoon? Is it 10 g? 500 teaspoons per day? So one teaspoon needs 60 000 trips.
I'm not following your math here. thegolfpsycho's statement is a visit to 2 Million flowers per teaspoon. Your 30 million trips would only produce 15 teaspoons per day, meaning it would take 51.2 days to produce a gallon of honey.
But some other questions emerge here.
Are there 50,000 foraging bees per day from one hive?
We must maintain this amount by replacing the bees that die off. So how many bees will we need to have in the egg stage to the young emerging bee stage?
How many nurse bees are needed to raise the brood?
How much honey is needed to feed the brood and nurse bees?
Also, do bees collect pollen and necter during the same visits to a flower?
How many flowers will be producing necter throughout the day?