How to get the account numbers which maintains negative balance for consecutive 5 days

Question

Here is what I am trying to do 
I am trying to get the accounts which has negative balance consecutively for five days
Here in this a/c 1 and 5 has consecutive negative balance
 how to pull these accounts using sql query. 
create table #p(cal date, ac# int, bal int)
insert into #p values  ( GETDATE(), 1, -1),
                       ( GETDATE(), 2, 1),
                       ( GETDATE(), 3, 1),
                       ( GETDATE(), 4, -2),
                       ( GETDATE(), 5, -6),
                       ( GETDATE()-1, 1, -1),
                       ( GETDATE()-1, 2, 1),
                       ( GETDATE()-1, 3, 1),
                       ( GETDATE()-1, 4, 2),
                        ( GETDATE()-1, 5, -7),
                        ( GETDATE()-2, 1, -2),
                       ( GETDATE()-2, 2, -1),
                       ( GETDATE()-2, 3, -1),
                       ( GETDATE()-2, 4, 2),
                       ( GETDATE()-2, 5, -6),
                       ( GETDATE()-3, 1, -2),
                       ( GETDATE()-3, 2, -1),
                       ( GETDATE()-3, 3, -1),
                       ( GETDATE()-3, 4, 2),
                       ( GETDATE()-3, 5, -2),
                       ( GETDATE()-4, 1, -4),
                       ( GETDATE()-4, 2, 1),
                       ( GETDATE()-4, 3, 1),
                       ( GETDATE()-4, 4, -2),
                       ( GETDATE()-4, 5, -2),
                       ( GETDATE()-5, 1, -4),
                       ( GETDATE()-5, 2, 1),
                       ( GETDATE()-5, 3, 1),
                       ( GETDATE()-5, 4, 2),                       
                       ( GETDATE()-5, 5, -1)
                     --  drop table #p

Answer 1

@ Jing
Again not sure if it is ok to comment on other people's answers, I hope you don't take it the wrong way, but your query will not account for CONSECUTIVE days. E.g. if the acc balance goes back to a positive value, day count must be reset.
Now I understand why people answered this so much faster than me LOL.
Edit: Besides, the requeriment for the acc being returned is that its value was negative for 5 days (120 hours). When a given account balance first switches to a negative value, it has 0 hours in that state. It all add a day to its "negative balance consecutive
day count" property the next time its value is checked (cal + 1). With that said, if your query worked, it would be cnt > 6 not cnt > 5.
Thanks for pointing the issue. I have improved my query  to address it.
 I try to come up with something to my understanding to the questions. It may not interpret right  from the question itself for various reasons.  I still consider it is a great learning experience.   Thank you for your comments.
create table #p(cal date, ac# int, bal int)
insert into #p values ( GETDATE(), 1, -1),
( GETDATE(), 2, 1),
( GETDATE(), 3, 1),
( GETDATE(), 4, -2),
( GETDATE(), 5, -6),
( GETDATE()-1, 1, -1),
( GETDATE()-1, 2, 1),
( GETDATE()-1, 3, 1),
( GETDATE()-1, 4, 2),
( GETDATE()-1, 5, -7),
( GETDATE()-2, 1, -2),
( GETDATE()-2, 2, -1),
( GETDATE()-2, 3, -1),
( GETDATE()-2, 4, 2),
( GETDATE()-2, 5, -6),
( GETDATE()-3, 1, -2),
( GETDATE()-3, 2, -1),
( GETDATE()-3, 3, -1),
( GETDATE()-3, 4, 2),
( GETDATE()-3, 5, -2),
( GETDATE()-4, 1, -4),
( GETDATE()-4, 2, 1),
( GETDATE()-4, 3, 1),
( GETDATE()-4, 4, -2),
( GETDATE()-4, 5, -2),
( GETDATE()-5, 1, -4),
( GETDATE()-5, 2, 1),
( GETDATE()-5, 3, 1),
( GETDATE()-5, 4, 2),
( GETDATE()-5, 5, -1),
( GETDATE()-6, 5, -1)
--update #p
-- set bal=-1*bal
-- where cal='2014-09-22' and [ac#]=5
;with mycte as ( Select *
,row_number() Over(Order by [ac#], cal) - row_number() Over(Partition by [ac#], sign(bal) Order by [ac#], cal) rnDelta
from #p)
,mycte1 as (
select * ,
sum(Case when bal< 0 Then 1 Else 0 End) Over(Partition by [ac#], rnDelta Order by [ac#],cal ) cnt
from mycte
SELECT distinct [ac#] from mycte1
Where cnt>=5
drop table #p