This is usually decided between you and your ex partner and will vary according to your circumstances, work and the age of your children.
Each family has individual routines and time constraints and you will need to balance these against the need for both of you to make quality time for your children.
Some parents have contact every day while others see their children once a month. Your yardstick should be whether your children seem happy with the amount you have decided on.To avoid confusion it’s good to plan holidays and birthdays well in advance so children can look forward it. Try to involve them in the planning of these dates so they can feel secure about what’s happening.
Once again if you are at all worried for your children’s safety with your ex, this can be discussed in the court hearing and the court has the power to limit contact accordingly. It may be, for example that your ex can have supervised contact or even indirect contact such as email and telephone only. Whatever the circumstances, the court considers contact to be the right of the child and only makes orders to promote their best interests.