If a job is lengthened by two or three days because someone forgot to order a part for a job, that costs time which equates to overhead costs. Many business owners try to reduce costs so that profits can be higher. Reducing wasted time may help even more. Look at all the jobs in the business. Personally, good time management practice would dictate that several errands be done in one trip and avoid one trip that accomplishes only one errand.
Many businesses can benefit from an audit of time management.