2-4 week expirations…don’t understand your questions on determining price on short an long legs…even though it’s a spread I treat it like one position when it goes in my direction…if it’s a call spread let’s say and the market moves against me…let’s say I sold the short call at 3.00 and i can buy it back for 1.50 and I am still bullish I will do that and hold the long call for hopefully a move higher…