It can definately happen in real time. Especially with lighter beers. From what Ive read very hoppy beers can skunk in as little as 30secs of intense sunlight.
In process: Belgian Wit
Secondary: Berliner Wiesse
On Tap/Bottled: Strong Dark Belgian Ale(bretted),Belgian Imperial Stout (2nd AG), Partigyle Dry Stout, Apfelweinx2, Dont Fear the RIIPA, Cream of three crops
Planning: Roggenbier, Biere de Garde, Golden Strong Ale, Barleywine, Something with Brett