How much time it will take if i start from scratch on android studio when i am a complete beginner

If you're a complete beginner and you study consistently, here's a realistic timeline:

Time	What you'll be able to do
1 week	Understand Kotlin basics and create simple console programs.
2–4 weeks	Build simple Android apps like a calculator, unit converter, or tip calculator.
2–3 months	Build apps with multiple screens, save data locally, and create a decent user interface.
4–6 months	Build real apps with login, databases, internet APIs, notifications, and publish-ready features.
6–12 months	Be capable of building and publishing professional-quality Android apps independently.

If you study 1 hour every day

• After 30 days: You'll have built 2–3 simple apps.
• After 90 days: You'll be comfortable building useful Android apps.
• After 6 months: You can start creating apps that people might actually use.

If you study 2–3 hours every day

You could reach the same level in about 3–4 months.

Since you told me you're starting from scratch

I wouldn't overwhelm you with theory. Instead, we'd learn by building.

Here's the order I'd teach you:

1. Install Android Studio.
2. Learn the absolute basics of Kotlin.
3. Build a Calculator app.
4. Build a To-Do app.
5. Build a Notes app.
6. Learn databases.
7. Learn APIs.
8. Build your own original app idea.

Every project would introduce just a few new concepts, so you're always learning by doing.

The most important thing is consistency. Even 1 hour every day is enough to make steady progress. Most beginners quit because they try to learn everything at once. Building small apps one by one is a much more effective approach.