Dick always says the average time at the Grand Canyon is 3 hours; I ask him where he got that info but he has never replied. That might be true for the train rides from Williams but not near true for the rest. Do you want to say you have been there (needs maybe 3 hours) or that you have SEEN it. Seeing it takes 2-3 days minimum.
We are going back for 6 days this Fall - be our 8th time I think. Once at N R and decided that was not worth the time to drive in and all. You see about 10% of the Grand Canyon there. Love the S R and so much to do and see and all times of day - sunrises and sunsets are the best.
And, yes, good walk / hikes as well. Comment about Bright Angel Trail - going even 1/2 mile down - is right on.
I do a lot of photography there - for my / our own pleasure and I sell prints and am published.
Enjoy one of God's masterpieces.
Lauren