Where is the maximum of TB for the plots? I could still generate more plots but from when it is no longer worthwhile?
My Setup, the last plots are done on Sunday.

690 0 2695000
690 2695000 2695000
36 5390000 140000
930 5530000 3630000
1800 9160000 7000000
105 16160000 410000
750 16570000 2920000
775 19490000 3020000
790 22510000 3080000
2700 25590000 10500000
800 36090000 3120000
900 39210000 3510000
900 42720000 3510000
1800 46230000 7000000
36 53230000 1400000
900 54630000 3500000
the limit is 2^64 nonce.
the tricky part is that your hardware must parse .024% of the plots filesize within the blocktime.
if you say you can maintain 50 mb/s during the plots are parsed the general answer is 240 seconds represent .024%.
this means at 50 mb/s 12GB are .024%. if i havent mixed up numbers this results in 12gb/.00024*100=5TB.
if you double your parse rate you can scan 10TB plots and if you can maintain 200mb/s 20TB and so on.