I;m sure if you work out the number of iterations this process will be going through, you'll understand why it's taking so long! ... and for the entirity of this...

what you probably want to do is create a new file (of say, 10Gb!) or manually increase the size of the DB file to something reasonable (say, 20Gb!). Although having...

you should be able to use

INSERT INTO tablename DEFAULT VALUES

to simply generate a record.