Money In Transit - Papal and BOA - Someone is holding onto my funds!

Today, I'm focusing on the fact that when I transfer money from my PayPal merchant account to my Bank of America checking account, it disappears for a surprising amount of time.  On Thursday Sept 2, 1pm PST, the money left my Paypal account. It's hard for me to imagine why it was not in my account on Thursday afternoon. It's really hard to imagine why it's not there on Friday, Sept 3. Or Saturday Sept 4.  Yesterday was  Sunday, Sept 5th (not there) and today is  Monday Sept 6th  (Labor Day). Still not there?  Who thinks it'll be there on Tuesday Sept 8th when it opens for business? End of Day?
September Transfer

Withdraw Funds to a Bank Account (Unique Transaction ID #45P018402U20xxxxx)
Total Amount:		-$26,000.00 USD
Time:		13:20:56 PDT
Status:		Completed
Subject:		Bank Account
Transfer to:		Bank of America (All except WA and ID) Checking (Confirmed) x-5119 -------------------------

Looking back at August's transfer...I see that the funds left on Aug 6th from Paypal in the morning and arrived three days later on 8/09. During those three days, who had the funds!

Withdraw Funds to a Bank Account (Unique Transaction ID #5TJ79122Y2******)
Total Amount:		-$4,000.00 USD
Fee amount:		$0.00 USD
Net amount:		-$4,000.00 USD
Date:		Aug 6, 2010
Time:		11:14:12 PDT
Status:		Completed
Subject:		Bank Account
Transfer to:		Bank of America (All except WA and ID) Checking (Confirmed) x-5119

BOA reported receipt of the funds:

Description:		PAYPAL DES:TRANSFER ID:5X8J24DC******* INDN:SPELLINGCITY.COM INC. CO ID:PAYP
	Posting Date:		08/09/2010
	Amount:		$4,000.00
	Type:		ACH Credit
	Account Number:		Business Economy Chk-5119

July:
left Paypal on July 4th, 10:32 am PST.
Arrived BOA on July 7th.  No time indicated.
Again, three days to transfer.

So why is September so slow, 8 days? It is Labor Day? Is it that it is a larger sum and so they'll hold it longer?