Decide what your body can do comfortably and safetly. If you have been relatively inactive, proceed slowly and gradually. Your body needs to be conditioned. Give your heart and muscles a chance to adjust to the demands of exercise. You will be able to increase your time and pace as your body becomes more fit.
Some people walk in the morning to prepare for the day ahead.
Some walk at lunchtime. Others like to walk in the evening to unwind and relax. Select the time that best fits your schedule and seasonal conditions. Walking immediately after eating is NOT recommended. Wait one to two hours after eating, if possible.