Lockdown can't be sustained more than 1-2 weeks after peak ICU occupancy passes, so it will be lifted in mid-May in the UK and possibly as early as May 1st in the USA. (I know the Eastern Coalition are kicking back against Trump's deranged demand for an early restart: I expect other states may also join in if their estimates of the long-term damage track reality.)
Trump is shooting for May 1st because he's been told the economy will take 6 months to recover, minimum, and he's shooting for the November election deadline. This is laughably optimistic, even if the pandemic had burned out by May 1st: we're in Greatest Depression territory already, the hospitality sector has crashed 75%, airlines have crashed 90%, etcetera. It's not going to be back to normal by November, even if the Fairy Godmother shows up and banishes the horrid virus with a wave of her wand. Period.
So. The immediate peak hospital occupancy will pass, lockdown will be lifted sector by sector (or all at once) and region by region ... and the 50% of COVID19 cases who are asymptomatic will go back to work, mingling with the uninfected.
1-4 weeks later there will be a secondary surge in infections and it'll follow the same exponential growth as the first spike in Feb/March. And lockdown will resume, probably in mid-June. (It may be mitigated by summer heat, in which case things will look good for a month or two longer, but I'm not holding my breath: even if heat prevents spread, the prevalence of air conditioning in public spaces in the US provides a transmission-friendly environment.)
If the howls of rage at the first lockdown are deafening, the second lockdown will be worse: think of toddlers being sent back to bed with no supper. And that's the lucky work-from-home class: the working poor—with no savings and jobs they need to be physically present for—are going to be increasingly angry and fractious at their exposure. Expect civil disobedience and possibly summer riots unless central banks throw money at the grassroots -- and not $1200 for 10 weeks: more like $1200 per week.