Anatomy of a $4k mistake

This was a really simple but stupid mistake:

Final table of the PR Big Deal $80k guar ($300+$20, 248 runners, 7.5% overlay)
- 8 players remaining
- average stack 19x bb
- Hero's stack 17x bb, Hero's rank 4th
- all opponents behind Hero have 10x bb or less in their stack EXCEPT for 2nd chip leader in CO.
preflop: folded to Hero in MP+1 who finds 88, Hero pushes for 17x bb, muck, insta call, muck, muck, muck (2 players, pot size 35.5x bb)
postflop: XXXXX, CO wins 35.5x bb w AA.

To more fully set the context: I was multi-tabling 3 big MTTs/Supers (in all MTTs, my stack value was higher than $1k real money). For the first ~8 seconds of my time in the PR hand, I was dealing with a decision in the Stars $1m guar. I'm not certain if PR has a time bank, but I assumed no (NOTE TO SELF: check if PR has a time bank for MTTs!!).
In the past ~1 hour of play, I had raised 3xbb/folded to reraise 3 times. Without much time to prudently analyze the situation, I pushed simply because I had all but 1 opponent covered.
I should merely have raised something like 3-4x bb, and mucked to a reraise from the big stack. My remaining stack is worth ~$4k.

The basic lesson here is, when multitabling, time-management priority MUST be given to the decisions that have greatest value. Yes, rocket science.

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Weekend MTT stats
ITM: 18.2% (2/11)
ROI: 18.9% (+$474.80)
Hours played: 12.5
Hourly rate: +$38/hr