Помогите, пожалуйста!!!!!!!!!!!!!!!

1. How long have you been doing these exercises 
-Ive been doing them for 1.5 hours
2. Since when have you been painting the picture
-Ive been painting the picture since autumn
3. How long has she been waiting for her lunch
-She has been waiting for her lunch for 0.5 hour
4. Since when have they been growing these plants
-Theyve been growing these plants since May
5. How long have you been staying at this hotel
-Ive been staying at this hotel for 3 days.