changed length amount from hours to minutes

topics/certifications/az-900.md

@@ -6,7 +6,7 @@
 |        **Official Link:**         | [Overview AZ-900](https://docs.microsoft.com/en-us/learn/certifications/exams/AZ-900)                              |
 | **Part of the requirements for:** | [Microsoft Certified Azure Fundamentals](https://docs.microsoft.com/en-us/learn/certifications/azure-fundamentals) |
 |           **Outline:**            | [Outline AZ-900](https://query.prod.cms.rt.microsoft.com/cms/api/am/binary/RE3VwUY)                                |
-|            **Length:**            | 1,5 hours                                                                                                            |
+|            **Length:**            | 90 minutes                                                                                                            |
 |       **Registration fee:**       | $99 (plus tax where applicable).  Other discounts possible.                                                        |
 |         **Exam format:**          | Various question types, taken in person at a test center or from home.                                             |
 |          **Difficulty:**           | N/A                                                                                                                |