Within mainstream, or historic, or traditional Christianity the truly devout probably dedicate about 15-hours a week to church and personal devotions (prayer and Bible reading/study). I base this on attending 4-5 hours of church per week (main service and 1-2 smaller group functions) and 1.5 hours per day of prayer and Bible reading. This person also tithes and probably gives another 2-5% to missions and special offerings. Most would say that church blessed far more than it drained, and that small group functions are a kind of "midweek pick-me-up." Devotions are more of a discipline, but most report experiencing refreshing, peace and strength from them.
I suspect that LDS put in significantly more time/energy. It can be fulfilling and rewarding, but perhaps sometimes exhausting. If so, how to reset? How to find balance? And, perhaps a more general question--one appropriate for all religious people: Should practicing faith be hard? Of course there are trying experiences, but I refer to the day-to-day. Should the regular practice of devotion to God be difficult?