I know every individual’s case is a mix of unique circumstances but I thought my experience would serve as an example to some people who might have questions about how an app spree affects one’s Fico score.
I opened 10 bank CC in a 3-week period (March 16 – April 9).Before that, I had 6 cards (4 bank cards + 2 store cards) with a AAOA of 11+ years. After all 10 accounts reported (last one reported on 5/19 and it was the card that I applied for last as well), my AAOA dropped to 4+ years. My total CL before the spree was $8,100. Afterwards, my total CL was $108,400.
Beginning myFICO scores: EQ 711 TU 702 EX 721
Ending myFICO scores (before they started rebounding): EQ 677 TU 680 EX 663
It is excruciating seeing my scores drop day after day without hitting rock bottom or even knowing what rock bottom looked like.
Finally this week my three scores are inching up again and I feel relieved! I don't think I'll ever pull another app spree again. NEVER. EVER. AGAIN.
Basically my score drop's timeline was as follows: Scores stopped dropping on 5/19. They started bouncing back on 5/20. So that means the "free-fall" ended 2 months and 3 days after I started the spree on March 16th and1 month and 1 1/2 weeks after I finished it on April 9th.
I will do an update of this post at the 6-month mark, to report whether my scores have recovered completely or better yet have surpassed my pre-app spree numbers.
*** EDIT***
edited all caps title
If you actually needed the cards (for whatever reason) dropping from 700-720 to 660-680 isn't that big of a deal if you don't have anything serious coming up. I would've made that trade NP personally.
Also you were something of an extreme case with the limited number of tradelines and yet the long AAOA compared to the vast majority of people on this forum.
No need to shout with the capitization of the title either 
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@Vivacious10
We are in a similar boat. Between 4/3 and 5/20 I added 7 new TLs. I have been watching as the new reporting trickles in. So far, the dent hasn't been too bad on TU and EQ, but I know that for the first time in years I will fall below 700 on EX. Even though the drop will be temporary, it's going to be a little sad looking at that number.
The saving grace here is the large number of student loans (12) from 2003 - 2005 that are paid but still reporting. That helps offset the ding to AAoA. WheRn everything finally comes in I should still be in 6 yr territory.
In addition to the new TLs, I am deliberately allowing a couple of large balances report for the first month, but utilization will still be relatively low. I'm guessing that by Aug. I should start to experience a steady uptick to all scores.
Considering the double digit additions you made, the hit really wasn't that bad. Time will be your friend.
@Anonymous wrote:I know every individual’s case is a mix of unique circumstances but I thought my experience would serve as an example to some people who might have questions about how an app spree affects one’s Fico score.
I opened 10 bank CC in a 3-week period (March 16 – April 9).Before that, I had 6 cards (4 bank cards + 2 store cards) with a AAOA of 11+ years. After all 10 accounts reported (last one reported on 5/19 and it was the card that I applied for last as well), my AAOA dropped to 4+ years. My total CL before the spree was $8,100. Afterwards, my total CL was $108,400.
Beginning myFICO scores: EQ 711 TU 702 EX 721
Ending myFICO scores (before they started rebounding): EQ 677 TU 680 EX 663
It is excruciating seeing my scores drop day after day without hitting rock bottom or even knowing what rock bottom looked like.
Finally this week my three scores are inching up again and I feel relieved! I don't think I'll ever pull another app spree again. NEVER. EVER. AGAIN.
Basically my score drop's timeline was as follows: Scores stopped dropping on 5/19. They started bouncing back on 5/20. So that means the "free-fall" ended 2 months and 3 days after I started the spree on March 16th and1 month and 1 1/2 weeks after I finished it on April 9th.
I will do an update of this post at the 6-month mark, to report whether my scores have recovered completely or better yet have surpassed my pre-app spree numbers.
*** EDIT***
edited all caps title
Congrats on your new credit! I did the same only in Nov. 10 to be exact, just like you. My scores were in the 750's - 760's range. They dropped to around 700. I did what you're doing now! 
I'm at 728, which is my mid score from all 3 from EQ. I also used the simulator & do repeatedly just to be sure it's working. With my new accounts, being just "paid regularly" every month, it will increase my fico from 838 to 850. So in a way, what we did should further us along as far as scoring goes. And I'm sure showing that we're responsible with these new accounts will also have a big affect on future lenders. Don't worry, it will bounce back plus more. 
I also app'd for the Venture & BofA sig card almost a month ago. We're also at about the same total CL's!