docs: --timeperiod argument

docs/backtesting.md

@@ -51,6 +51,16 @@ python3 ./freqtrade/main.py backtesting --realistic-simulation --live
 python3 ./freqtrade/main.py backtesting --datadir freqtrade/tests/testdata-20180101
 ```
 
+**Running backtest with smaller testset**
+Use the --timeperiod argument to change how much of the testset
+you want to use. The last N ticks/timeframes will be used.
+Example:
+
+```bash
+python3 ./freqtrade/main.py backtesting --timeperiod -200
+```
+
+
 For help about backtesting usage, please refer to 
 [Backtesting commands](#backtesting-commands).
 

docs/hyperopt.md

@@ -168,6 +168,16 @@ If you would like to learn parameters using an alternate ticke-data that
 you have on-disk, use the --datadir PATH option. Default hyperopt will
 use data from directory freqtrade/tests/testdata.
 
+### Running hyperopt with smaller testset
+
+Use the --timeperiod argument to change how much of the testset
+you want to use. The last N ticks/timeframes will be used.
+Example:
+
+```bash
+python3 ./freqtrade/main.py hyperopt --timeperiod -200
+```
+
 ### Hyperopt with MongoDB
 Hyperopt with MongoDB, is like Hyperopt under steroids. As you saw by
 executing the previous command is the execution takes a long time.