The BP is 165 C and even under vacuum it can be challenging to evaporate. You will need a vacuum pressure less than 1mbar to evaporate this at room temperature. A rotary evaporator is typically too leaky to achieve this. Also, watch out for the the cold trap, you need a really good one as else DMA will condense in all kinds of places and then it will damage components of your system. If you have many samples then loo for a Genevac system as these are resistant to these kinds of agressive solvents.