Douglas L. answered 07/31/19
The answer really depends on what is one the page and how it is organized. Have you overdone exposition etc? Are there two separate yet parallel stories that can be separated? It sounds like you will push around a 1000 pages. This is not unusual for some authors, especially in epic fantasy. Before you get it in front of an editor, it will have to be pretty tight in terms of tension.
The revised finished manuscript for A Game of Thrones was 1088 pages long (without the appendices),[35] with the publication following in August 1996.[11] Wheel of Time author Robert Jordan had written a short endorsement for the cover that was influential in ensuring the book's and hence series' early success with fantasy readers.[36] Blood of the Dragon, a pre-release sample novella drawn from Daenerys's chapters, went on to win the 1997 Hugo Award for Best Novella.[37]
The 300 pages removed from the A Game of Thrones manuscript served as the opening of the second book, entitled A Clash of Kings.[31] It was released in February 1999 in the United States,[13] with a manuscript length (without appendices) of 1184 pages.[35] A Clash of Kings was the first book of the A Song of Ice and Fire series to make the best-seller lists,[26] reaching 13 on The New York Times Best Seller list in 1999.[38] After the success of The Lord of the Rings films, Martin received his first inquiries to the rights of the A Song of Ice and Fire series from various producers and filmmakers.
Mr. Martin had worked as a published author for years and still struggled with length. He had people to help him trim by the time he wrote the first Song of Ice and Fire. You likely need to make sure that you have a compelling sample to get in front of an agent.
Good luck!