Fischer 1 minute + 2s/move is "invalid time settings"; what time settings are valid?

Hi! I wanted to play a very fast blitz game during lunch, so I picked Fischer with 2 seconds per move. But, I got an error when I tried to create the game, saying this was “invalid time settings”.

I assume OGS thinks my game is too fast to be real go. What time settings are allowed, though?

Trial and error shows 1m+3s/move works.

My guess is that it has something to do with network latency preventing anything shorting from being consistently playable.

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I think that 3 seconds is the limit. But I have to say that there is a huge difference between 3 seconds byo-yomi and Fischer 1 minute + 3 seconds.

I would certainly prefer to play 1 minute + 2 seconds Fischer against an opponent who plays 3 seconds byo-yomi.