नेहाभिक्रमनाशोऽस्ति प्रत्यवायो न विद्यते ।
स्वल्पमप्यस्य धर्मस्य त्रायते महतो भयात् ।।
nehābhikramanāśo'sti pratyavāyo na vidyate ।
svalpamapyasya dharmasya trāyate mahato bhayāt ।।
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A man does karma-yoga for a small amount of time or may be he carries on with for a long time.
But in case he is unable to complete it owing to various reasons, there are no sins associated with it. One fine day (after re-births), this karma-yoga will be completed!!
When you are doing karma with the expectation of good phalas (outcomes), it cannot be called karma-yoga. There are no protections against great fear of samsara-bandha etc..
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Karma-Yoga is the path for Moksha. The effort undertaken for Karma Yoga never goes waste unlike other regular work (Agriculture, Industry, Office etc..).
Even if observed in very small amounts, this Yoga has the powers to save us from samsara-bandha
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Nish-kaama karma is the jnanopaaya (mind) aradhana of Vishnu rupam. It never goes waste, even if abandoned in this life
Vishnu-puja once started, always continues & even a small amount of it protects us from samsara-bandha