A Brooks saddle can take a long time to acclimatise to your Butt---Or Vice-versa. Whether it is brooks or not- you will find that it is a good idea to take the weight off the saddle ocasionally. Saves a lot of pain on a long ride and also rests the leg muscles a bit.
On the road bike I have taken a lot of care to make certain that the saddle is comfortable. Took time to set the saddle up properly and money to eventually find the saddle that suits my butt. I don't rest the butt often till over 50 miles but downhill and pedals level and just take the weight off. It helps. But the mountain bike is the complete oposite. I spend more time off the saddle over rough ground and even uphill it is out of the saddle most of the way. The saddle is only really used to sit on when on the road to the hills or on the way back. The rest of the time it is only used to perch on occasionally.
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How long was I in the army? Five foot seven.
Spike Milligan