Blenheim -- too much for 1 visit?

Yes it can be done very comfortably. No worries. You will NOT feel rushed at all. I did those add-on tours too.

Yes, you can do them all. Blenheim is a good visit.

Also, you can see Winston Churchill's grave in a small churchyard a few miles from Blenheim.

Churchill's grave is in the churchyard of St Martin's in Bladon . Buried in the plot , as well , are his wife and parents , and his American cousin ( a real life Cora Crawley ) Consuelo Vanderbilt . Consuelo married the ninth Duke of Marlborough , and dutifully provided him , as she quipped , with " An heir and a spare " . She is a prominent figure in the story of Blenheim . Read about her here - https://en.wikipedia.org/wiki/Consuelo_Vanderbilt

I'd just like to say that if you want also to look around the grounds thoroughly, I don't think you can do all of that in a day. On our first visit, we toured the palace and went out to the battle monument. On our second visit, we spent our time outside and found plenty to see in the various and extensive gardens and grounds. Both times we were staying in Oxford, so were able just to take the local bus lines over to Blenheim. The time that we decided to get off in the village rather than the specific palace stop, we missed the actual bus stop and had to beg the driver to let us off on the outskirts of the village! But that way we got to see a pheasant and some other newer bits of the village, plus a nice walking approach to a different entrance into the palace grounds.

w/r/t the Consuelo Vanderbilt comment: You do know that Winston Churchill's mother was American too, right? See, for example, https://www.winstonchurchill.org/the-life-of-churchill/life/family-man/sir-winston-and-his-mother/

Of course ! She was Jenny Jerome from Brooklyn .

By the way , in addition to the well known John Singer Sargent portrait of the family at Blenheim , there is a beautiful one of Consuelo and Ivor ( the spare ) by Boldini at the Metropolitan Museum of Art in NYC

Also , 0ne of history's quirks of fate was that Consuelo had been secretly engaged to Winthrop Rutherford prior to her forced marriage to Marlborough . Rutherford eventually married Lucy Mercer , who was FDR's longtime lover , and was with him when he died in Warm Springs in April 1945 . Life is indeed an unpredictable and trying endeavor . By the way - What does w/r/t mean ?

w/r/t = with regard to

Harold , Thanks , as always . I have difficulty translating these arcane abbreviations that are often substitutions for cogent syntax . By the way , we're on for 2/17 . I just changed the date , Sue reminded me - it's now correct .