What is a reasonable compensation for an attorney who has rendered services in connection with a legal proceeding?

Among the factors to be considered as to what constitutes a reasonable compensation for an attorney who has rendered services in connection with a legal proceeding are the nature of the litigation; its difficulty and the amount involved; the skill required and the skill employed in handling the litigation; the attention given; the success of the attorney's efforts; his learning, his age, and his experience in the particular type of work demanded; the intricacies and importance of the litigation; the labor and necessity for skilled legal training and ability in trying the cause; and the time consumed. (Shannon v. Northern Counties Title Ins. Co., supra, 270 Cal.App.2d 686, 689, 76 Cal.Rptr. 7.)