Question about using the rotobrush in after effects.

Basically I was doing in after effects composition where I needed to use the rotobrush. However, it turns out that the composition duration is not long enough. If I extend the duration time, then the rotobrush stops, and I cannot get it going again, without noticeable differences. Is it possible to keep the rotobrush going and extend the effect in after effects?
 
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