Hi! here you have an example:

// ===========================
// apply after x bars in trade to prevent premature exits
// ===========================
// ----- General settings
DEFPARAM CumulateOrders = False
rrmultiple = 3
x = 20
// ===========================
// Example
// ===========================
atr = averagetruerange[14](close)
sma10 = average[10](close)
sma60 = average[60](close)
setupLong = sma10 crosses over sma60

// ===========================
// Entry rules
// ===========================
IF NOT longonmarket and setupLong THEN
   
   BUY 1 CONTRACTS AT MARKET
   
   stopprice   = close - 1.5*atr
   targetdist  = rrmultiple * (close - stopprice)
   targetprice = close + targetdist
   entrybar = barindex
   highestPrice = close
   SET STOP pRICE stopprice
   SET TARGET pRICE targetprice
   
ENDIF

// ===========================
// Exit after X bars if price < limit
// ===========================
if longonmarket then
   bars=bars+1
   highestPrice =  max(high,highestPrice)
   if bars>x then
      stopprice = 0.5*(highestPrice+tradeprice)
      SET STOP pRICE stopprice
   endif
else
   bars = 0
   highestPrice = close
endif
// ===========================
// Graphs for monitoring
// ===========================
GRAPH bars COLOURED("red")
GRAPH x coloured("blue")
GRAPHONPRICE stopprice COLOURED("red")
GRAPHONPRICE targetprice COLOURED("green")
GRAPHONPRICE highestPrice COLOURED("blue")
GRAPHONPRICE sma10 COLOURED("fuchsia")
GRAPHONPRICE sma60 COLOURED("orange")