Scholars of the Salafi and Ahl-e-Hadith approach aim to follow the hadith directly rather than a single madhab. On qasr this has produced several positions, some close to the majority, some quite different.
Shaykh Ibn Baz and the Permanent Committee
Shaykh Abd al-Aziz ibn Baz and the Saudi Permanent Committee for Research and Fatwa adopted the majority's approximate limits for clarity: a journey of about 80 km, and a stay of more than four days making you a resident. Within those limits, shortening is the sunnah and better than completing. Combining is permitted for the traveller, especially while on the road.
Shaykh Ibn Uthaymin: custom decides
Shaykh Muhammad ibn Salih al-Uthaymin, following Ibn Taymiyyah, held that no fixed distance or stay is established by clear text. A journey is what people customarily regard as a journey, and a traveller remains one as long as they have not settled, whatever the number of days. He pointed to the Prophet's ﷺ 19 days in Makkah and 20 days at Tabuk, shortening. He also advised that those who follow the fixed limits for caution are doing well.
The Ahl-e-Hadith and the three-farsakh hadith
Anas ibn Malik reported that when the Prophet ﷺ went out a distance of three miles or three farsakh (the narrator was unsure which), he prayed two rak'ahs (Sahih Muslim). Some Ahl-e-Hadith scholars in the subcontinent take the three-farsakh wording as the minimum. The conversions they give range from about 14.5 km to 22 km. The calculator's default of 16.6 km uses the Hashimi mile, and you can enter your scholar's figure instead.
Other Ahl-e-Hadith scholars follow the approximately 80 km view, so check which position your scholar holds.
How long can you stay?
Many in this approach use the four-day limit. Others hold that you may shorten for up to 19 days, based on the report of Ibn Abbas: "The Prophet ﷺ stayed 19 days shortening, so when we travel for 19 days we shorten, and if more, we complete" (Bukhari).
Combining and sunnah prayers
Combining Dhuhr with Asr and Maghrib with Isha is permitted while travelling. The regular sunnah prayers are left, except the two rak'ahs of Fajr and the witr.
Compare these views on your own trip in the calculator, or select the three-farsakh view from the school list.