Most firms in my market charge a transaction fee against the buyer agent's commission.

You can of course charge them for the extra days.

Would it be considered “public charge” if it is one time?

In these conditions, investors typically focus on faster, lower-cost flips that add clear, high-value improvements without overextending time or budget.

I generally dont like the idea of charging for more tenants.

Granted this charge could be the one from 1996?

Real Estate grows your wealth considerably faster when you leverage since the appreciation is on the asset, not the equity. 

You can include a steep penalty per day that you charge if they fail to move out by the agreed-upon date or hold more money in escrow if you don’t trust them to move out. 

This depends on the lender and what is charged in the orig fee.

The tenant has been facing these excessive charges for about three months but only just reached out to me.In Akron, I understand that the property owner is typically responsible for the bill, though our lease specifies that the tenant is responsible.