N5 is an achievable target in about 90 days of consistent daily study for a complete beginner — not because the material is trivial, but because it's genuinely the smallest, most bounded level of the five. Here's a realistic structure, broken into three phases.
Weeks 1-4: Foundations
The first month should focus almost entirely on hiragana and katakana fluency, since every later phase depends on being able to read them without conscious effort. Alongside that, start building core everyday vocabulary (numbers, greetings, common verbs and adjectives) and the most basic sentence structures (subject-object-verb order, simple particles like は, が, を, に).
By the end of this phase, you should be able to read simple hiragana/katakana sentences at a reasonable pace without sounding them out letter by letter.
Weeks 5-8: Building sentence patterns and early kanji
The second phase introduces the core N5 grammar patterns — present/past tense conjugation, basic te-form usage, simple requests and invitations, and comparison structures — alongside your first 50-80 kanji. This is also the point to start incorporating short reading passages and basic listening practice, rather than studying grammar and vocabulary in isolation.
Resist the urge to rush ahead to N4 material here even if N5 grammar starts to feel easy — solidifying these patterns thoroughly makes every later level noticeably easier.
Weeks 9-12: Exam-format practice and weak-point review
The final phase shifts weight from pure learning to active practice under realistic conditions. Start working through full N5-format practice questions across all sections (vocabulary, grammar, reading, listening), noting which specific question types or grammar points you consistently get wrong. Spend the remaining time targeting those specific weak points rather than reviewing everything evenly — by this point, broad review has diminishing returns compared to targeted correction.
In the final 1-2 weeks, simulate full timed practice tests to build comfort with the actual exam's pacing and format, not just the content.
What "90 days" assumes
This timeline assumes reasonably consistent daily study (45-60 minutes) and no significant prior Japanese exposure. Less consistent study will naturally extend the timeline — and that's fine. The phase structure (foundations, then patterns, then exam practice) matters more than hitting exactly 90 days; a slower but consistent version of this same plan will get you to the same place.
The practical takeaway
N5 rewards a structured approach more than raw hours — spending the first month on hiragana/katakana fluency and the last month on exam-format practice, rather than treating all 90 days identically, is what actually determines whether the material sticks by test day.