That depends. Usually, migrating anything but a very small application from one framework to another is seen as a time-consuming task (and one which might take more time than you expected). However, there are various factors which could make it easier. Aside from the size or complexity of your application and how well you understand it, the ease of migrating between frameworks depends on which framework you are using, how similar it is to the framework you want to migrate to, and whether you have organized your code in a way that is tightly coupled to your framework. It also depends on how well your code is exercised by your test suite, since you will want to avoid causing bugs in the course of the migration, and it is much easier to locate and fix these bugs if you have good test coverage.

If your code is simple or well-organized, you have great tests, and you are moving from one framework to a framework which works in a similar way, then it is possible that migrating from one framework to another might be relatively easy. Otherwise, it is hard to predict how much effort will be required. In the worst case, you will have to essentially rewrite the entire application and write new tests to verify that everything works as well as it did before the migration.
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