It will be 18:00 - 17:00 ET, isnt' it?

StartWeek=72100;
EndWeek=52200;
Weekend=1+8;

If you only plan to trade US assets/FX and trade during all of the open hours, then there is no need for setting AssetMarket/StartMarket.

If you want to restrict your trading to stock exchange trading hours (while there are bars available for 23 hours), then you would use:

AssetMarket=ET;
StartMarket=900;
EndMarket=1500;