In a solid-state laser incident on a {\text{LiNdP}}_{\text{4}}{\text{O}}_{\text{12}} crystal, pumped by a short light pulse, giant pulse oscillation without the use of resonator Q switching is realized. Tuning of the oscillation pulse duration from 2\text{\hspace{0.17em} up} to 20 ns is achieved by changing the cavity length from 24 to \text{3 \hspace{0.17em} mm} , respectively. Our analysis of this mode of laser radiation is made on the basis of the rate equations. The factors influencing oscillation pulse duration are investigated. It is shown that in a limiting case the minimal value of the pulse duration is limited by only the rate of excitation transfer from the pumping band to the metastable level.