How long in the Pokemon TV series did May like Ash?

It's difficult to say definitively whether May ever had romantic feelings for Ash in the Pokemon anime. The series never explicitly shows May expressing romantic interest in Ash.

While there are some moments where May might appear to be showing signs of affection for Ash, such as:

* Being jealous of other girls who show interest in Ash.

* Sometimes getting flustered around him.

* Showing concern for him when he's in danger.

These could be interpreted as friendship or simply being close companions, and not necessarily romantic attraction. The anime focuses more on their strong bond as friends and rivals on their journey.

Ultimately, the interpretation of May's feelings is subjective and up to the viewer. The series leaves it open-ended, allowing for different interpretations of their relationship.