stint-workを労苦と訳すのは 英英辞典のrestrict in the amount of something, especially moneyということからすると賃金を得るための厳しい仕事の意味からの訳となったものだろうと考えた。

with object, often with negative
1Supply a very ungenerous or inadequate amount of (something)  ‘stowage room hasn't been stinted’
1.1Restrict (someone) in the amount of something, especially money, given or permitted.  ‘to avoid having to stint yourself, budget in advance’
1.2no object Be very economical or mean about spending or providing something.  he doesn't stint on wining and dining’
(noun) 1A person's fixed or allotted period of work.  ‘his varied career included a stint as a magician’
2mass noun Limitation of supply or effort.  ‘a collector with an eye for quality and the means to indulge it without stint’
Origin: Old English styntan ‘make blunt’, of Germanic origin; related to stunt.
A small short-legged sandpiper of northern Eurasia and Alaska, with a brownish back and white underparts.
Genus Calidris, family Scolopacidae: four species

(英文 from Lukacs)
If we follow the path taken by labour in its development from the handicrafts via cooperation and manufacture to machine industry we can see a continuous trend towards greater rationalisation, the progressive elimination of the qualitative, human and individual attributes of the worker. On the one hand, the process of labour is progressively broken down into abstract, rational, specialised operations so that the worker loses contact with the finished product and his work is reduced to the mechanical repetition of a specialised set of actions. On the other hand, the period of time necessary for work to be accomplished (which forms the basis of rational calculation) is converted, as mechanisation and rationalisation are intensified, from a merely empirical average figure to an objectively calculable work-stint that confronts the worker as a fixed and established reality. With the modern ‘psychological’ analysis of the work-process (in Taylorism) this rational mechanisation extends right into the worker’s ‘soul’: even his psychological attributes are separated from his total personality and placed in opposition to it so as to facilitate their integration into specialised rational systems and their reduction to statistically viable concepts.