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Currently there isn't support for this type of constraint (directly). The planner tries to find a time-minimal collision free path to the goal. However, it would be possible to add this extension to the planner (and I'll do so in the next release).

Until then though an easy hack to get the planner to reach the goal on the interval (t1,t2) would be to put a "fake" dynamic obstacle at the goal location from time 0 to t1 and another fake dynamic obstacle at the goal location from time t2 to some large time. This is essentially how I will implement your feature in the next release anyway.