Time Scaler
Time Scaler for GTA 5 is this mod lets you manage over playing time, do it faster, slower or even equal to actual.

Options:
Normal (2s = 1 real time gaming)
Stop time
Time x 2 (1s = 1 m)
Time x 30 (1s = 15 m)
Time x 60 (1s = 30 m)
Time x 120 (1s = 1 h)
Time x 240 (1s = 1 h)
Time x 480 (1s = 4)
Time x 960 (1s = 8 h)
Time/2 (4s = 1 m)
Time/4 (8s = 1 m)
Time/8 (16s = 1 m)
Time/15 (30s = 1 m)
Time/30 (1 m = 1 m)
Time/60 (2 m = 1 m)

How to use:
F6-open menu
NUMPAD 5-confirm
NUMPAD 0-back
NUMPAD 8-up
NUMPAD 2-down

Source:
Time Scaler