0. n=0
1. n=n+1
2. Run bitcoin-qt
3. Generate an address
4. Quit bitcoin-qt
5. Rename wallet.dat to wallet_n.dat
6. Goto 1.
1. n=n+1
2. Run bitcoin-qt
3. Generate an address
4. Quit bitcoin-qt
5. Rename wallet.dat to wallet_n.dat
6. Goto 1.
I'd just add a "Wait for 5 minutes" between 2 and 3.
Alternatively, you can generate all (x) addresses from the same wallet, export the (x) p-keys, import each of them in a new fresh wallet, and ultimately delete the first generating wallet.