What I do is not memorize the speech. Rather, I remember the points and if I am familiar enough with the topic (which I should be!) then just talking rather than reading off a mental script is so much better. For example, I had to deliver a speech to my class about Henry Ford, a ten minute long speech. Rather than memorizing it or putting it on index cards as did the remainder of the class, I just knew him so well that I was able to talk about him. I did not remember at all exactly how my script was. However, I was so immersed in the topic I could talk as if I was him. If you decide that you want to memorize a speech, get going quickly! Read it over about ten times. Then, try reading it out loud using the script. Over time, begin to look at the script less and less until you are confident. Remember, if you miss a few words or forget exactly what your lines are, this is not a play. Nobody knows what you were supposed to say, so as long as you expressed what you intended you will be fine.
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You must practice 2 hole hours and keep the the speech in your head.
Memorise them at an average rate of 5 per minute.
Are you sure you meant minutes? Because there's 10 minutes in 10 minutes. But if you meant how many seconds, 10x60=600 seconds in 10 minutes.
I have to memorize these lines for the play in a week. Memorize the scientific method for tomorrow. I memorize pi for fun in my free time.
It is ten minutes.