SQL & PL/SQL :: Retrieving The Data Based On Count?

I want to retrieve the data based on the count.

Sample data
AccountSubAccountDate
11.12-Mar-10
11.23-Mar-10
11.34-Mar-10
11.42-Mar-10
11.56-Mar-10
21.67-Mar-10
21.78-Mar-10
21.82-Mar-10
3210-Mar-10
32.111-Mar-10
32.22-Mar-10
32.313-Mar-10
32.414-Mar-10
32.52-Mar-10
42.616-Mar-10
42.717-Mar-10

What i want is I want the data which account is having more than 5 subaccounts within the last one month. Also need data with other date criteria like last 100 days if more than10 sub accounts. need single query.

Output is :

3210-Mar-10
32.111-Mar-10
32.22-Mar-10
32.313-Mar-10
32.414-Mar-10
32.52-Mar-10

Having more than 8lacks in my database. i wrote the query but it is taking much time and didnt give the data even after 14 hours.

My query is :
select * from table a where account in
(select account from table b where b.subaccount=a.subaccount
and b.date>=sysdate-35
group by b.account having count(b.subaccount)>5)
union
select * from table a where account in
(select account from table b where b.subaccount=a.subaccount
and b.date>=sysdate-100
group by b.account having count(b.subaccount)>10)

how to retrieve the Subaccounts which satisfies my requirements.