You may try this. I did not test it, so you are likely to have to make corrections, besides inserting your code to handle your strategy:

DEFPARAM CumulateOrders     = False                                   //no more than 1 trade allowed
DEFPARAM FlatAfter          = 235959                                  //Comment this out to keep trades running overnight

ONCE StartBreak             = 000000                                  //Start of BreakOut strategy time, no trades
ONCE EndBreak               = 070000                                  //End   of BreakOut strategy time, trades on
ONCE NoMoreTrades           = 240000                                  //Time to stop entering new trades

ONCE MinPrice               = 0                                       //Lowest  price (initial value)
ONCE MaxPrice               = 0                                       //Highest price (initial value)

IF (time >= StartBreak) AND (time <= EndBreak) THEN                   //Check at each bar
   IF close < MinPrice THEN                                           //Update minimun if a lower closing price is met
      MinPrice = close
   ENDIF
   IF close > MaxPrice THEN                                           //Update maximum if a higher closinfg price is met
      MaxPrice = close
   ENDIF
ENDIF

IF OnMarket THEN                                                      //Set variables to initial ZERO after entering a
   MinPrice = 0                                                       //   trade, so they are ready for the next break out
   MaxPrice = 0
ENDIF

IF (time >=  EndBreak) AND (time < NoMoreTrades) THEN
   .
   .                                                                  //you wanna put your orders here according to
   .                                                                  //  your conditions
   .
ENDIF

Hope this is what you were looking for.

Roberto