<p class="MsoNormal"><span style="mso-spacerun:'yes';font-family:Calibri;mso-fareast-font-family:宋体;
color:rgb(0,0,0);font-size:16.0000pt;mso-font-kerning:1.0000pt;">It depends on the product. Some work within hours, while others take one to two days for full effect.</span></p>