Unless I am wolfishly hungry I pretty much always take this long to eat an orange or any segmented fruit.
I like to peel my oranges first then pull the segments apart and nibble the center a little to begin the process of peeling the membrane off of the cells. Now I can pop the segment inside out and the seeds can fall away .
Holding the now detached membrane I can consume the juicy cells of orangey goodness free of any other part of the fruit. Yes I have always done this if I have a whole orange.
Sliced orange smiles are OK but it is very hard not to get any pulpy bitterness that way.
Grapefruit need to be cut in half and consumed with a teaspoon or a runcible spoon. They also must be Ruby Red.