I have these forsythia cuttings in my home office window. There are two pots with smaller cuttings that I scored and treated with Dip-and-grow. They are in peat moss / perlite mix, seed starting medium. They are covered with plastic sandwich bags. At 4 or 5 days, no wilting. There was slight wilting the first day.
There are also 4 cuttings in water. They are much bigger. I also scored them and treated with dip-and-grow. I doubt that did anything, since the water probably washed it off. It's possible some is absorbed and not washed off.
If all of these take, that's about all I think I need for a nice hedge. If they don't, well they are free plants, so not a problem. Plus there are the ones I have soil layered in the mixed hedge row.
One thing I'm guilty of that frustrates me when I'm reading other gardening blogs, is that the start is nicely presented, but there isn't always follow up. That's especially true if they don't grow. If they do grow, the info is easier to present. I'll try to keep a record of how these do whether they grow or not. I've read that forsythia can be started in water, and I think I have done it, but my memory isn't perfect.