A sehaj pahtt is reading Sri Guru Granth Sahib Ji in order from start to finish in a pace that suits you. For example you can read two Angs in a day and then the next day read 10 Angs etc. Ideally a Sikh is meant to complete a Sehaj path of whole of Sri Guru Granth Sahib Ji once a month. But if that is not possible even few Angs a day is will take your soul to next levels. Once you have completed a sehaj pahtt, it is to be started again; in this way throughout your whole life you will be doing darshan of Sri Guru Granth Sahib Ji. There are no excuses we all have access to Guru Ji through the net and if you don’t know Gurmukhi read the English translations.
http://www.sikhnet.com/sggs/translation/