I had a 742 score before applying for about 7/8 new cc's. Once the dust settles, it will affect your score for a while. It will go down but start climbing pretty quickly. Mine went down to 701. I think with all the HP"s & new cards, it shocked my score! It does take some time for all of the cards to report. Some are much quicker than others. Leased BMW & it took them over 3 months before they started reporting. I did check the fico stimulator & ultimately my scores will go much higher than they were once the accounts age a bit. It's just one of those things. Probably the reason they tell you not to apply for credit unless you really need it. Any as you know, once you start, you can't stop! 
After a year you'll gain it all back, after two years you'll gain it all back and some more.
@Kenro wrote:I applied for quite a lot of credit cards in past week or so... I had 710 Experian Fico score and it went down to 690 as of now.
My reported total CL is showing up as 2 500, however, if I add up all my approved credit cards... My current total credit limit is above 35k.
Can I expect my score to improve once all these credit cards start reporting to agencies?
My old utilisation was around 20%.
I would not expect too much here as the drop in overall util might be outweighed by the impact of the new accounts. Over time you will see your score increase as the accounts age.
My oldest credit line is a mere 11 months old, so it seems like there isnt much to lose with the Average account open age.
12 hard credit enquiries though 
only positive here is that new inquiries do not hurt my score anymore...
I still feel lucky, 20-30 point drop for such big increase in CL available and CL in region of 10k for 2 cards...
While being a student and less than 1 year old credit file.
Just hope I dont get called up and my CL slashed...
Its just stupid, I got denied for low end and "Student" credit cards and got approved for CC at Visa Signature level...
