If you are looking for a mnemonic, because I too find these terms hard to remember, then I use the following.
r-strategy = focus is on reproducing as much as possible - then all the other traits, grow fast, die young, etc, tend to follow.
K-strategy = focus is on the Kapacity (Germanised spelling) of the environment, i.e. do not exceed the carrying ...
This is not a full answer, but I post it as one because the reasoning is too long to post it as a comment.
You can make a rough estimation using a few assumptions.
1) Let's say 1 generation = 25 years, so 1000 years are 40 generations.
2) Let's say that half of the population is able to leave offspring, so the probability of one individual having ...