We tend to think of cuando as the translation for when, but in a question it usually means what day rather than what time.
- ¿Cuándo llega? What day does he get here?
- ¿A qué horas llega? What time does he get here?
En la tarde
The question ¿A qué hora? sounds as if a specific hour is requested in the answer. However, it is common to give a vague response, such as en la tarde. It will be ready in the afternoon. Note that en la tarde usually means after the workday, that is, at 5:00pm, 6:00pm or 7:00pm. If you show up at one in the afternoon expecting your item to be ready, you’re too early. La tarde can go all the way to dark, 8:00pm, although that general time of day is sometimes called tarde-noche. ¿A qué hora pasas? En la tarde-noche. Late afternoon, early evening.
Como a las cinco
To be noncommital, add a word like como.
- Como a las cinco. Around five o’clock.
- Te veo onda siete. See you around seven. Informal.
- Tipo nueve. Around nine o’clock. Informal.
- Alrededor de las dos. At about two o’clock. Formal. Note the use of de rather than la.
- Aproximadamente a la una. A la una, aproximadamente. Around one o-clock. Formal. Recall that una is singular. Standard is es la una but I have heard son la una as well.