Sorry, no online dictionaries contain the exact phrase unknown amount of time.
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Reverse dictionary results:
1. indefinite
2. uncertain
3. indeterminate
4. unspecified
5. undetermined
6. improbable
7. invisible
8. silent
9. unnoticeable
10. anonymous
11. debated
12. dunno
13. ignorabimus
14. immemorable
15. impalpable
16. imperceivable
17. imperceptible
18. imponderable
19. impractical
20. imprevisible
21. inappreciable
22. inarticulate
23. inaudibly
24. incommunicado
25. inconnue
26. inconspicuous
27. indecipherable
28. indefinable
29. indeterminant
30. ineffable
31. infinitive
32. inimaginable
33. inscrutable
34. insensible
35. intangible
36. irrecognizable
37. irreconcilably
38. jawbreaking

You can look up the words in the phrase individually using these links:   unknown ?   amount ?   of ?   time ?
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Not helpful? You might try using the wildcards * and ? to find the word you're looking for. For example, use
unkn*to search for words beginning with unkn, or
*timeto search for words ending with time
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