Deshuttering period relates to the maturity of concrete and depends on the ambient temperature. Forms shall not struck until the concrete has reached strength at least twice the stress of which the concrete may be subjected at the time of removal of form work.
Assuming standard conditions of workmanship and quality of materials, you can refer to the following time-frames for the removal of forms.
Form
Summers
Winters
(Temp <18° C)
Walls, columns and vertical faces of structural members
24 hrs.
48 hrs.
Removal of props under slab
Spanning up to 4.5 m
7 days
14 days
Removal of props under beams and arches spanning up to 6 m
