Comment by Schiendelman

A typical LEO optical satellite has maybe a 60km swath at high resolution. And it isn't just a couple of hours - an orbit doesn't go over the same spot every two hours. You only may get 1-2 passes a day with a given type of constellation.

China would be using their Yaogan-41 (geostationary) to try to track, which might work, in good weather, during daytime, IF the carrier group was south of Japan (it's equatorial). Carriers deliberately transit through weather, strike groups disperse broadly and use decoy behavior in wartime, and a geostationary optical satellite won't know which blip is the carrier and which is a support ship 50km away.

Every night, you lose the carrier group and have to find it again in the morning, if you can. Usually you can't, even with China's layered approach using optical, SAR, ELINT, and OTH radar.