Get the size of the table as per row wise.( Rows in group by clause)

Hello,
I am using ORACLE 11g Standard edition and RHEL 4.
I have a situation in which i want to know the size of the limited rows of the table.
I am moving table's rows from one table(one tablespace) to another table(another tablespace) While moving the rows I want to be sure that the size of the rows is good enough to fit in the another table's tablespace free size. So before inserting rows in another table i will check the size of rows and the free space in tablespace and perform the action as per.
Here is the senario with example :-
I have a table called MAIN_TAB which has a column as DATE_TIME which stores the systimestamp when the data was inserted. See the code below ...
select * from main_tab;
ID     VALUE DATE_TIME
1     DATA      18-MAY-11 12.00.00.000000000 AM
2     DATA      18-MAY-11 12.00.00.000000000 AM
3     DATA      17-MAY-11 12.00.00.000000000 AM
4     DATA      17-MAY-11 12.00.00.000000000 AM Now i will fire a group by date_time query to know how many rows for each systimestamp.
select trunc(date_time),count(id)
from MAIN_TAB
group by trunc(date_time)
DATE_TIME     COUNT(ID)
17-MAY-11               2
18-MAY-11               2So now you can see i have 2 rows for 17th and 18th May. I want to know what is the size of the data for 17th and 18th May in MB. I know how to get the size of the whole table but i want only the limited rows size as per date.
So the question is how can i get the size of a table's 2 rows data ???
Provide me some guidance.
If the question is not clear to you , let me know ....
Thanks in advance ...

Thanks Pravan for your reply. But Its still not so usefull for me. Can you please give some clear idea about what you wanna say ??
I fired the DBA_TABLES view for my table i.e. 'MAIN_TAB' The AGV_ROW_LEN column showed 0 but that does not mean that my table has no data it, for sure it has 4 rows in it and consists of some data . . . . .
Please clarify what i can do to get the size of rows related to that particular date ......
thanks.

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