Unlocking expert ghost times

Expert Staff Ghost times
After beating the Normal Staff Ghosts by a certain margin of time, you can unlock the Expert Staff Ghosts. The following are the approximated times for unlocking them:

Mushroom Cup

Luigi Circuit

Normal Staff Ghost Time: 01:29.670
Unlock Time: 01:25.742

Moo Moo Meadows

Normal Staff Ghost Time: 01:37.856
Unlock Time: 01.33.571

Mushroom Gorge

Normal Staff Ghost Time: 02:16.110
Unlock Time: 02.07.755

Toad's Factory

Normal Staff Ghost Time: 02:22.480
Unlock Time: 02.15.681

Flower Cup

Mario Circuit

Normal Staff Ghost Time: 01:44.777
Unlock Time: 01.39.183

Coconut Mall

Normal Staff Ghost Time: 02:30.764
Unlock Time: 02.24.788

DK's Snowboard Cross

Normal Staff Ghost Time: 02:34.693
Unlock Time: 02.24.725

Wario's Gold Mine

Normal Staff Ghost Time: 02:19.583
Unlock Time: 02.14.932

Star Cup

Daisy Circuit

Normal Staff Ghost Time: 0:56.822
Unlock Time: 01.48.791

Koopa Cape

Normal Staff Ghost Time: 03:03.022
Unlock Time: 02.54.897

Maple Treeway

Normal Staff Ghost Time: 02:58.633
Unlock Time: 02.50.229

Grumble Volcano

Normal Staff Ghost Time: 02:28.237
Unlock Time: 02.19.524

Special Cup

Dry Dry Ruins

Normal Staff Ghost Time: 02:30.949
Unlock Time: 02.21.681

Moonview Highway

Normal Staff Ghost Time: 02:16.802
Unlock Time: 02.07.016

Bowser's Castle

Normal Staff Ghost Time: 03:04.836
Unlock Time: 02.55.017

Rainbow Road

Normal Staff Ghost Time: 03:05.895
Unlock Time: 02.59.293

Shell Cup

GCN Peach Beach

Normal Staff Ghost Time: 01:34.233
Unlock Time: 01.30.698

DS Yoshi Falls

Normal Staff Ghost Time: 01:16.461
Unlock Time: 01.12.901

SNES Ghost Valley 2

Normal Staff Ghost Time: 01:06.595
Unlock Time: 01.03.752

N64 Mario Raceway

Normal Staff Ghost Time: 02:14.799
Unlock Time: 02.07.915

Banana Cup

N64 Sherbet Land

Normal Staff Ghost Time: 02:48.651
Unlock Time: 02.37.784

GBA Shy Guy Beach

Normal Staff Ghost Time: 01:45.568
Unlock Time: 01.39.255

DS Delfino Square

Normal Staff Ghost Time: 02:41.807
Unlock Time: 02.33.107

GCN Waluigi Stadium

Normal Staff Ghost Time: 02:32.882
Unlock Time: 02.24.645

Leaf Cup

DS Desert Hills

Normal Staff Ghost Time: 02:10.233
Unlock Time: 02.01.141

GBA Bowser Castle 3

Normal Staff Ghost Time: 02:58.304
Unlock Time: 02.50.637

N64 DK's Jungle Parkway

Normal Staff Ghost Time: 02:58.264
Unlock Time: 02.49.028

GCN Mario Circuit

Normal Staff Ghost Time: 01:59.771
Unlock Time: 01.55.267

Lightning Cup

SNES Mario Circuit 3

Normal Staff Ghost Time: 01:38.880
Unlock Time: 01.34.828

DS Peach Gardens

Normal Staff Ghost Time: 02:34.894
Unlock Time: 02.29.006

GCN DK Mountain

Normal Staff Ghost Time: 02:57.744
Unlock Time: 02.50.248

N64 Bowser's Castle

Normal Staff Ghost Time: 03:19.323
Unlock Time: 03.06.723