Hi,

You would need to set up a review schedule.

To commit to memory, you would try to redraw the map from memory and compare to the original. Tony Buzan, the creator of mind maps set out the following schedule for reviewing material not just mind maps.

Shortly after you have learned it - I always think within the next 20-30 mins if not sooner.
One day after you have learned it.
One week after you have learned it.
One month after you have learned it
Three to six months after you have learned it.

Thanks