Question
  
  As-salaamu alaykum,
  I have a question concerning madd. Many of the Arabs tend to shorten long 
  vowels to short vowels when the long vowel occurs at the end of the word in 
  speaking .
  To give an example I read the male youth,  "al-fataa." 
  My Egyptian friend told me I had read the female youth,
"al-fataa." 
  My Egyptian friend told me I had read the female youth,
   "al-fataah" and told me to say "al-fata" 
  instead, in reality reading fathah instead of alif.
"al-fataah" and told me to say "al-fata" 
  instead, in reality reading fathah instead of alif.
  
  Also, Many Arabs have also developed vowel quality distinctions to 
  differentiate long and short vowels. Is this correct?
  
  I do not have a trained teacher so how can I know the correct madd?
  jazakumullah
  
  Answer
  
  Wa alaikum assalaam wa rahmatu Allahi wa 
  barkatuh. 
  
  May Allah increase you in knowledge and 
  reward you greatly for your efforts to learn the Arabic language.  
  
  Spoken colloquial Arabic cannot be measured 
  in the way we measure vowel counts and mudood (plural of medd) in tajweed.  
  This unfortunate situation is because spoken Arabic has been corrupted away 
  from the Arabic spoken at the time of the Prophet,
   , to what is today many dialects based on 
  hearing and copying, not by a set of rules.  The only time you would be able 
  to measure in the same way would be when talking to someone with an excellent 
  background in classical Arabic who can speak classical Arabic easily with the 
  correct vowelings.
, to what is today many dialects based on 
  hearing and copying, not by a set of rules.  The only time you would be able 
  to measure in the same way would be when talking to someone with an excellent 
  background in classical Arabic who can speak classical Arabic easily with the 
  correct vowelings.  
  
  The common Arabic colloquial 
  pronunciation for the word 
   does have a 
  lengthening for the alif a little longer than a fat-h, but shorter than the 
  natural correct lengthening of two vowel counts.  The word
 does have a 
  lengthening for the alif a little longer than a fat-h, but shorter than the 
  natural correct lengthening of two vowel counts.  The word 
   is 
  pronounced (when stopping on this word) with a longer lengthening because if 
  we go back to our tajweed rules, we know that this is a different medd than 
  the natural two count lengthening of
 is 
  pronounced (when stopping on this word) with a longer lengthening because if 
  we go back to our tajweed rules, we know that this is a different medd than 
  the natural two count lengthening of 
   .  The word
.  The word
   has 
  a medd letter following by one letter, and when we stop on it, we stop with a
 has 
  a medd letter following by one letter, and when we stop on it, we stop with a
   saakinah; making a presented sukoon 
  lengthening,
 saakinah; making a presented sukoon 
  lengthening,  , 
  which has a  lengthening 2, 4, or 6 vowel counts.  Although those speaking 
  colloquial Arabic will not lengthen the alif in the word
, 
  which has a  lengthening 2, 4, or 6 vowel counts.  Although those speaking 
  colloquial Arabic will not lengthen the alif in the word 
   a 
  full four vowel counts, they do prolong it to two vowel counts.
 a 
  full four vowel counts, they do prolong it to two vowel counts.  
  
  
  The vowel lengthenings in colloquial Arabic 
  then are quite subtle, but there is a difference between a medd and a vowel 
  count, just not the correct classical Arabic difference.  
  
  We understand your confusion but urge you 
  to continue your study of the Arabic language.  The best advice we can offer 
  is to separate colloquial Arabic from classical Arabic and practice classical 
  Arabic with those proficient in speaking it.  To apply your study of the 
  mudood, we suggest you listen to Qur'an recitation by some known expert 
  reciters, such as Sheikh Al-Husray or Sheikh Basfar.  
  
  Wa iyyakum wa-l-muslimeen.