It is quite a big job...
My time estimation maybe wrong...
Maybe around 12-15h all in total (engine out, transmission out, changing seal will take couple min. compared to the rest, engine in, transmission in...only to take the engine out quite a few things must be removed......don't know all the English words for those things

)
P.S.Once everything is out, check for all the seals that you can see and change them...My Toyota service did that when everything was out....it think there is couple more seals, but I don't know which one are those exactly...I know only that they are not expensive, maybe $10-$15...
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1994 Toyota Camry 220 SEI Automatic

RHD (yes, stupid right hand drive since I moved to SA

)...