No action or proceeding whatsoever shall be brought or maintained by any person who is or may become entitled to have conveyed to him any real property under the terms of any bond for a deed to real property or under the terms of any agreement in the nature of a bond for a deed to real property and who is not in possession of the real property which is the subject of such bond or agreement, to enforce or procure any right or interest granted or assured under the terms thereof or any law or custom relating thereto unless such action or proceeding is commenced within ten years of the day limited therein for the performance of the acts and things upon which the conveyance of such real property is conditioned.L. 53: p. 205, § 2. CRS 53: § 118-7-17. C.R.S. 1963: § 118-7-17.