It's a free program and all you have to do is download and install it. Doesn't even nag to buy the paid version so you don't have much to lose.
I've parked my drone in the middle of a 2500 acre plot, took a movie while I rotated the drone 360° and then stitched an image. I didn't think the processing time was all that long, and I wasn't even using my picture editing computer. The result wasn't exactly what we're talking about here but I've also done images of several still pics and they take even less time. You don't have to be extraordinarily careful with overlap between successive images as the program seems to use AI to chop and merge the images and they come out fairly close.
Try it and see is my advice.