this is how I will do it..... assuming that you can fit it in 15" material or 24" depending on the size.
When I have a long and skinny file to cut, I place it in a way that I will use the material more efficiently, I will have to do a more that one splice or split, but saves material. It may look more work, but I've done many times and I will say that is easier than apply transfer tape to a big piece with a little of the material used, installation could be more difficult. Just mark where the vinyl where it should be from the ground or use a laser to line it up all the pieces then install one by one, of course.
Last time I did a 6.5"" tall text by almost 14 ft long, I used my 30" material and fit the top left of the text at the top, then copied the same text and place as a second line on text and move it to the left to fit, then the next part of the text, I was able to cut only 30" material by 48" long, one time apply transfer tape and then just match the text, cut the overlap and finally, get the 6.5" tall text by 14ft long.
And I did this manually, did not use the art board option, which is a good option too, and I use it when I do a big murals, last month I did one that is 112" tall by 35ft long.