It's really YMMV. I've applied for several CC's and a car refinance within the last 2 months and haven't been denied for anything. I am done for a while though until the next great offer comes along. I won't hesitate to apply for it even if I am not at the "91" day mark. Here's my recent apps for reference:

1/1 Auto Refinance
1/1 DCU Visa $7.5K (was auto approved when I refinanced my Auto Loan)
1/17 Amex SPG $6.4K
1/21 SW Plus $9K
1/21 SW Premier $12K
2/08 AA Executive $13K
2/25 Chase IHG $3K
2/25 AA Executive $10.5K

Credit score on 1/1 was 722. Credit score as of 2/14: 751.