5pm
Queen's Park,
Pimlico,
Paddington,
Maida Vale,
Marylebone,
Charing Cross,
Chipping Barnet,
Golders Green,
Hendon,
Ealing Road,
Preston Library,
Ealing Central,
Stamford Hill,
Hammersmith,
Fulham,
Islington Central,
Kingston,
Brixton Central,
Streatham,
Beckton Globe,
Green Street,
Stratford,
Richmond,
Sutton Central,
Whitechapel,
Balham,
Battersea,
Battersea Reference,
Putney,
Tooting
6pm
Wilsden Green,
Canary Wharf
So yeah, not that late at all really. I would suggest finding a late-night opening Starbucks or coffee shop to study in if you want to study later, but then on a Sunday that might be hard.
Hope I helped. (I never want to see another website of a London borough again :P)