Many players prefer developing their characters before the campaign starts, or to use the process as a guide for choosing skills and abilities. This does lengthen character creation though. To offset this, focus on questions that would best help everyone get the story or campaign rolling, and leave the rest for later. During the campaign. Assuming you're not playing a one-shot game or a short story, feel free to slowly hand out character questions as the campaign progresses.
Some players enjoy thinking, writing and working on their characters between sessions.
This is a perfect way for them to do all three and help you at the same time. Whip out your questionnaire for players who have arrived early, while food is being ordered or prepared, or while you are setting up for the game. Privately or publicly. You have a choice of dealing with some or all of your questions as a group or on an individual basis. However, some questions might be fun for your players to collaborate on and discuss together.