Mine took less than 12 hours. Took exam, went to an enrollment center to be fingerprinted for TWIC & HME. Then my "eligibility status" turned green on TWIC tab and on the HME tab it stated I was approved. So I call the 855# listed on the site and they told me over the phone I was approved for both HME and TWIC and I could head to the DMV in the morning since they transmit the HME info no longer requiring you to have the letter in had like they once did.