It should be done nearly instantly, as the interface tries to generate audio at x16777215 real-time. Wait for generated audio appear in audio player. All voices have lower and upper pitch and speed limits. Note that BonziBUDDY voice is actually an 'Adult Male #2' with a specific pitch and speed.
Microsoft Sam TTS Generator is an online interface for part of Microsoft Speech API 4.0 which was released in 1998.
