The time within which, accordingly to its application, machine works, and an object of work and working groups are under load, is the effective active time. The purpose of the research was the order statistics of effective active time of limbing and conversion at chainsaw use in two technology and two habitat variants. The effective active time of limbing and conversion of one tree was most frequently from 0.5 s to 10.49 s in variant in which the limbing included tree crowns and only thicker branches cutting and the conversion included rods meant for chipping. The strong tree’s branching in fresh mixed coniferous forest had influence on the prolonged limbing time. The share of S_2a assortment in total volume of harvested wood had influence on the conversion time, besides the number of wood assortment cutting.

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