It's 52 as long as you use "TWO" and not "DEUCE" and "THREE" and not "TREY".
I used ACE, TWO, THREE, FOUR, FIVE, SIX, SEVEN, EIGHT, NINE, TEN, JACK, QUEEN,
KING and counted the letters below:
1. A
2. C
3. E
4. T
5. W
6. O
7. T
8. H
9. R
10. E
11. E
12. F
13. O
14. U
15. R
16. F
17. I
18. V
19. E
20. S
21. I
22. X
23. S
24. E
25. V
26. E
27. N
28. E
29. I
30. G
31. H
32. T
33. N
34. I
35. N
36. E
37. T
38. E
39. N
40. J
41. A
42. C
43. K
44. Q
45. U
46. E
47. E
48. N
49. K
50. I
51. N
52. G
Edwin