You can insert the internal condom (female) up to eight hours before having sex.
If you stand up with it in, the internal condom (female) may hang slightly out of the vagina or anus. If you want to insert it early but avoid the tail, try wearing a snug pair of underwear to hold the external part of the condom closer to your body.
References:
- World Health Organization Department of Reproductive Health and Research and Johns Hopkins Bloomberg School of Public Health Center for Communication Programs (2018) Family Planning: A Global Handbook for Providers. Baltimore and Geneva. Retrieved from https://apps.who.int/iris/bitstream/handle/10665/260156/9780999203705-eng.pdf?sequence=1