No, far too long. We'd have some sort of SLAM time if we had a LAM time. That said,
there is this thread.
Paddington (H&C/Circle) and Paddington (Bakerloo/Circle/District) are different.
Edgware Road (Circle/District/H&C) and Edgware Road (Bakerloo) are different.
Hammersmith (Circle/H&C) and Hammersmith (District/Piccadilly) are different.
Bethnal Green (Central) and Bethnal Green (Overground) are different.
Shepherd's Bush (Central) and Shepherd's Bush (Overground/Southern) are different.
Shadwell (DLR) and Shadwell (Overground) are different.
Canary Wharf (DLR) and Canary Wharf (Jubilee) are different.
Euston (Victoria/Northern) and Euston (Overground/London Midland/Virgin Trains/Caledonian Sleeper) are different.
West Hampstead (Jubilee) and West Hampstead (Overground) are different.
West Croydon (Tramlink) and West Croydon (Overground) are different.
Liverpool Street (Central/Circle/H&C/Met) and Liverpool Street (Overground/TfL Rail) are different.
Any two stations with different names are different, for example, Monument is separate from Bank.
Tangy, some clarification on Walthamstow Central would be handy. I've heard rumours that the barrier system has changed there. Is this true? Or do they still count as separate?
Remember to make sure you visit all stations by the correct mode, e.g. no Kentish Town by Thameslink. Remember also to get yourselves Travelcards that cover Watford Junction, Chesham, Cheshunt and Shenfield. Or use what I call an Oyster Covering - this involves tapping in at a convenient point just before heading up to, say, Watford Junction, then tapping out on the way back at a point where your Travelcard is valid once more. I used this method for the London Overground challenge, tapping in at Euston (surface station), heading up to Watford Junction, then at Willesden Junction, where I passed by an Oyster barrier and was once more within the Travelcard zones, touched out.
Please clarify whether you will be using the Emirates Air Line Dangly Way (this is, after all, an All modes), and remember you must also visit Battersea Park by London Overground. No skipping Battersea Park - Tractakid will strike you down!!