Each individual is different, so it is impossible to pinpoint a specific number of daily decisions that applies to every individual, but Time magazine puts the number in the thousands. Decision making is executed on extremely small to large scale.
Many different types of decisions provide the infrastructure of an individual's daily life. There are life decisions, such as those to get married, make a major purchase, have children, go to college, move, etc. Then there are major decisions that may not be life altering, but do affect the outcome of an individual's day, such as the decision to get out of bed, to bathe, go to work or school, eat, etc. Then there are decisions that are so minor that an individual may not always be consciously aware that he or she is making them.