My testing place made me wait over an hour, but thats not typical. If you are going to sub, practice (I practiced with water). Get a thermometer and see what the temp is in your test sample (that you have hidden) after 1/2 hour and 1 hour. The secret to subbing is handing that sample to the collector at 94-98 degrees. Once you have practiced, you will know exactly when to nuke your friend's donation and how long you have to get to the place to test. Refrigerate it if he gives it to you the day before.