What worked for me
Soldier530,
Obviously what revereman said is spot on. X seconds are for $#%^ if you can't count live at the tables. Swing by your local casino, don't bring any cash, and try backcounting.
These 2 pointers will also help bring your speed down dramatically:
1. Hold the deck upside down, so you are looking at the faces of the cards and not their backs.
2. Now fan through the cards instead of flipping over one at a time. Additionally, practice counting in pairs. So instead of counting each single card at a time, learn to see (for Hi-Lo) 2,4 as +2, and 10,A as -2, and so on and so forth.
If you practice in this way, you'll cut your time in half in about a week if you want to.
Ian