This is from the sunnah but not obligatory.

Is it must to say ‘hamdan i katheeran tayyiban mubaarakanfeeh’ after saying ‘Rabbanaa wa lakal-hamd’ upon rising from the ruku position?

Prayer | March 27, 2017 4:41 am
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I am travelling to England to visit my parents for a month inn shaa Allah, in that months time my salaah will be shortened right or after a few days I can resume to pray normal number of rakaat?
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Will the prayers not be accepted if we don’t cut nails after 40 days?