Fixing the script extender itself won't take that long as it doesn't need to hook that many functions (although depending on how much free time people have and whether there are any surprises, it could still take longer than most people expect). Fixing all the mods that depend on it will take much longer, as between them, they hook lots more functions than the script extender itself, and with this update, it's not just a case of most functions being the same, but at a slightly different address (as was typical with creation club updates, which tools could help with), but instead lots of functions have changed slightly due to using an updated compiler, and lots of functions have been inlined differently (so instead of just existing once, they get copied into every function that uses them, and then optimised differently in each place based on the surrounding code).