Max buffer setting in import function?

I was told I could shorten the time it takes to import a large table by increasing the buffer setting. I currently have it set at 5000000. Is there a maximum limit that I have to stay below?
I'm trying to import 56 field table that contains about 4 million rows. It's taking hours to complete. Here's the import statement I'm using. Any help on how to speed this up would be great! Thanks in advance.
imp login_name tables=hourlies log=C:\hourlies.explog file=C:\hourlies.expdat FROMUSER=login_name ignore=Y commit=y buffer=5000000 ANALYZE=N INDEXES=N

If so, you can import with direct (does create the actually SQL command and execute 1 rows at a time)Import can not use direct path - only conventional. Oracle has added direct path capabilities to Data Pump in 10g.
Since you always import data in conventional mode the general rules for the performance tuning are appiled - gbrabham already mentioned disabling triggers and indexes, foreign key constraints. IF you do not want to import statistics - set statistics parameter to none.
Create the trace file, check wait events - basically tune it the way you tuned the regular inserts.
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