This is a difficult question to answer because it varies so much from team to team. Some club soccer teams practice every day, while others only practice a few times a week. It all depends on the coach's philosophy and the level of competition the team is playing in.
Generally speaking, most club soccer teams will practice at least 3-4 times per week. This gives the players enough time to work on their individual skills as well as learn and execute new team strategies. Practice sessions are typically 1-2 hours long, although again this can vary depending on the coach's preference.
If your child is interested in playing club soccer, be sure to ask the coach how often practices will be held. This will help you better understand what kind of commitment you'll need to make and ensure that your child is able to attend all of the practices.