They have been very clear, there has never been a suggested end date.
It's the same reasons they won't discuss any "exit strategy"
They do not have the data yet
They don't want Joe Public making up their own dates
Look at how much interpretation has been done already far, how many people when have decided on their own version of the guidance.
So we sit and wait and, if we can handle it, we watch all the daily updates so we can see and hear what is actually said.
To be honest the crappiest journalist questions have been quite helpful, as they require calm, simple repetition of the previously calm and simple explanation. You can't miss the intended message by the time the eleventy third time a question gets asked, usually about something Raab has just said cannot be known at this time!!
Just assume we're at home for the long run, maybe a month after the peak has been reached and the curve obviously flattened. Or another similar country relaxes its lock down to lighter than ours and suffers no alarming escalation - so not what Spain has just done.