From start of gameplay to end of gameplay - 55m12s In game time - as shown at end of Alien World - 52m46s

Decided to have a go at Expert difficulty in Space Invaders 1999 on PS1 (via Emulator) and I think I done alright. Few deaths here and there, just rapid firing as per usual.

Will try and improve this. Just taking a break from THPS2 runs!