Just be careful of compressing your forks too much for too long.
Time shouldn't be an issue on these bikes but too much is always a concern. Don't compress more than its normal travel, without a rider the suspension wont need to be compressed as far anyway. On a gas charged fork I agree its not good to keep them compressed for long periods but our forks use a spring. Spring fatigue is a function of number of cycles mostly. Holding a spring in one position does not fatigue it unless you are outside the designed travel. A spring will be designed to go through the whole travel without over-stressing it. Some springs do take an initial set but beyond that they don't change unless it is over stressed. The manual does give a lower limit on the spring length, the number of cycles is what will cause it to fatigue, a bike ridden on lots of bumpy roads will have a shorter spring life than one on a smooth road.