There isn’t a one-size-fits-all answer, not even close but I shared some thoughts on that in my reply to Jackvu70 above in this comment thread.

Sage advice, thx for sharing. The old adage when it comes to investing or trading is “sell down your position(s) to the level at which you can sleep at night”.

Just caught & corrected a typo: …”wouldn’t” set a stop on all 3…

What I often do when I find myself in a trade that I no longer want to be in, whether I was undisciplined and didn’t set a stop or maybe I did & the trade is either profitable or slightly underwater but for whatever reason I don’t have confidence in the trade but decide not to close it out, I will set a stop above the previous reaction high (on a short trade) and let it ride. If they stop me out, I get taken out at the same level that position already traded at before & I’m out of the trade. If the trade goes on to pan out & hit my price target(s), all the better.
Looking at the 60-minute charts of QQQ, SPY & IWM, that would be a move above 172.53 on QQQ, 277.41 on SPY & 156.24 on IWM. Personally, I wouldn’t set a hard stop on all 3 above those levels (Friday’s highs), at least not before or immediately after the market opens tomorrow but maybe set a hard stop on one after the first hour of trading (to avoid the sharp swings that often follow the opening bell) and then the others either shortly thereafter or on the following day.
As far as targets & time frames, I still believe there is a decent but not extremely strong case to be made that we are in the latter stages of a bear market rally. I know that is a big IF, but if so, then my preferred downside price targets for the next leg down would be just over 23% downside on SPY from here. Should that scenario play out, it would likely happen relatively quickly, in approximately 3 months, give or take although keep in mind that forecasting where a stock or the market will go is hard enough while nailing the timing of that move brings in a whole other level of difficulty.
Assuming that the market is headed to new all-time highs in 2019, then my minimum target for the next pullback, which would likely begin this week or next by the latest, would be the 161ish level on QQQ and I think that will be hit in one week or less after the market tops (remember, stocks tend to fall much faster than they rise). I am also very much open to the possibility & likelihood of a deeper pullback even if the market is going to new highs and those targets would be T2–T3 on the recent QQQ short trade and down to as low as the 258.90 level on SPY.

Trends are up. It was too early to call a downtrend following guts or experience rather than relying on crossovers anticipation

I believe that Randy’s target price on shorting QQQ would come to us eventually sometimes this spring or this year.
Last year his official/unofficial trade ideas like DWT, TZA, GDX, TQQQ, SQQQ and CANE were stopped out a few times. I kept them for another two or three or four months and was able to book profits although Randy suggested that I should not get married to a single trade.
If you are worried about your current trades, it will be better closing them as soon as possible. It is not good for your health.

Personally I think this may be a make break week for the short trade. One thing I will be watching tomorrow will be Walmart should give us an idea on the health of retail.