'I've spoken to Ebay and they've said there is no time limit'

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Sorry to be pessimistic, but it's hard to believe what ebay CS  say much of the time ☹️

Many examples of complete fabrication have been seen on these boards.

Ebay CS like to get callers off the phone as fast as possible (to meet their 'calls answered within the *however long* metric)

Ebay CS like to say whatever the caller wants to hear (in order for the caller to tick the *best* box in the after call survey, if they are given one....)

And if ebay CS don't know the answer they appear to have free reign in just making up whatever they want/think it *ought* to be.

....... I know this all sounds totally unbelievable from a Global Tech company, but it is true.🙁

Don't believe them.

In your case I would do what papso suggests: cancel the whole thing,....then relist as buy-it-now, they re-buy and they collect all at the same time...from your driveway/house!