Is it permissible to demand a large dowry to cover the exorbitant costs of marriage in light of the deteriorating economy, and what is the description of an Islamic wedding in light of the expensive customs?

Exaggeration in dowries (mahr) goes against the guidance of Islam. Blessings are found in facilitating the dowry and keeping it small. A father should strive for his daughter's blessing. Requesting a dowry to cover wedding attire and expenses is not wrong. The wedding is for announcing the marriage, and there is no specific duration for its days prescribed by the Sharia.