The source shouldn't be an issue even if the timestamp is reused. Timestamps just don't add a ton of entropy - a timestamp is generally 64bits, so even if it we

The source shouldn't be an issue even if the timestamp is reused. Timestamps just don't add a ton of entropy - a timestamp is generally 64bits, so even if it were actually random you could only ever get 64bits of entropy. And it's obviously way way way less than that since the clock is probably somewhat accurate, the computer is probably less than ~10 years old, and it's probably not way in the future. So it should be fine to add in, but I don't know how many bits you'd want to count that as.