What is the statute of limitations for a motion seeking to amend the constitution?

The statute of limitations to be applied is determined by the nature of the right sued upon, not by the form of the action or relief demanded. (Jefferson v. J. E. French Co., 54 Cal.2d 717, 718, 7 Cal.Rptr. 899, 355 P.2d 643; Leeper v. Beltrami, 53 Cal.2d 195, 1 Cal.Rptr. 12, 347 P.2d 12, 77 A.L.R.2d 803.)

The right to amend is properly denied when it is obvious that plaintiff is seeking the legally impossible. (Kiang v. Strycula, supra, 231 Cal.App.2d 809, 42 Cal.Rptr. 338.)