When You Should Use the Future Perfect Continuous
Use the future perfect continuous to project yourself into the future for the duration of an ongoing activity from now up to a point in the future.
The ongoing activity will be completed by a certain point in time (in the future).
subject ( I ) + auxiliary (will ) + auxiliary (have) + auxiliary (been) + verb -ing (studying)
This tense is used with action verbs like washing, studying, and practicing. For more features to Table 1. Future Perfect Continuous.