I submitted my tax returns via efiling, however I was chosen to submit documents for verification.

You should have received a confirmation that all is ok by now? If not then it could be a few days or weeks still. You just have to be patient and wait while this happens unfortunately.

Thanks, I have received an email with the completion letter, eveything was verified and IT34 was not amended. How long will it take before I get my refund?

It should be in your account tomorrow.