A little longer than an hour. Asked a few questions on php knowledge. Nothing really too advanced. Also asked me some questions on Magento, probably would have asked more had I had more experience with Magento, At the end, they had me do a test where i had to write a function to print out a binary tree when given a certain depth. The people who did the interview were great. They were friendly, casual, and the interview didn't feel too formal. I was comfortable, and the interview overall went pretty well. Also when i couldn't answer something, they provided great detail into helping me understand what i couldn't answer.