Begin/Commit

Hi,

I was wondering is there a limitation in the number of sql stmt that can go 
between a begin and commit.

I have a very large file that contains many updates and inserts (I mean 
many).  And it is taking too long to restore the data.  Pg_restore is out of 
the questions at the current moment because of the data version.

Example,
Begin Work;
....
...
.. (1000 update/inserts sql smts)
Commit Work;

Is this allowed???? 

Thanks

LL