Sean said he enjoyed putting himself “in the pain cave” and just focused on putting one foot in front of the other.
The father-of-two said the hardest part of his mission was the logistics and the toll it took on family life.
He added: “I could be up and down a Munro in sub-four hours, but even then there was likely to be a three-hour drive before and a three-hour drive after.
“So even the shortest days were still 12,14 or 16 hours.”
Sean was supported during one of the climbs by Paul Tattersall, who was the first man to complete the challenge in just 81 days.
He said he had a few more adventures on his radar but had been warned by his wife not to take on anything as extreme.