It would be really helpful to sales and account managers if the expiry date of a quote could be extended.
When creating a quote there are options to set the expiry for 30 days, 60 days etc so these options are frequently used.
It is also preferable to setting a shorter deadline for quote expiration as it helps to focus the customer on a timescale for placing an order.
If the deal then does not close within 30 days the customer can no longer access the link to the quotation.
The only option then is to create a brand new quote with all of the same details, as there is no way to extend or clone the existing quote.