As you have said , you are not able to cope with the situation right now. Your symptoms of day dreaming need to be further explored in terms of continue, associated thought process, associated symptoms etc. After evaluation of symptoms profile and impairment in your personal, academic domain, management in form of therapy along with some medications will be needed. Your query is how much time it takes to get you normal or motivated for your study or daily routine, it's depend on symptom severity, duration that can be commented after detailed history taking regarding your symptoms
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