The tick chartprice historyoption gives you a tick by tick historysince your login to the system (its working on your current session level), which means that if you logged to your system from an hour for example then you will find the data in the tick chart list from an hour and if you re-login then you will find empty tick chart list and will start saving the data tick by tick from the moment you logged in.
In the case you logged in from 15 minutes for example and need the data before that you can use Price History option in the main chart.
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