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Their is no admission. Donations though are appreciated to help with maintenance and enhancements.
There is some lighting at night but in general it is best to visit the Shrine during daylight hours. Hours that the chapel is open are less during the winter and stormy days.
You can walk through the majority of the Shrine in a half hour or less but you can spend hours here if you read through the pillars, visit the gift shop, read about the history of the Shrine, spend time in prayer, enjoy the sounds of nature, spend time at each station of the cross, etc
The path leading to the top of the hill is a gradual climb starting with sidewalk which turns into a dirt path which winds through the stations of the cross or you can climb the stairs. The trail would be considered easy to moderate for most people.