The county council has defended paying out more than £750,000 of taxpayers' cash in wages to staff suspended from work.
The authority has paid 39 employees a total of £764,343 since April 2009.
In one case a Lincolnshire County Council employee on an annual salary of £64,559 pocketed £90,000 following a suspension of 523 days. The individual was later dismissed for "gross misconduct" after an investigation was completed.
But the council has refused to reveal the details of the offence.
In the Midlands, the council is behind only Leicester City Council and Leicestershire County Council in the list of authorities which have spent most on wages to suspended staff.
The figures, collated by the Taxpayers' Alliance, also revealed the county council spent more than the authorities in Worcestershire, Northamptonshire, Herefordshire and South Derbyshire combined.
Its study shows that since April 2009, 7,640 working days have been lost through suspension. An average investigation takes 196 days to complete – the longest for all 78 Midlands councils.
Over the same period, the City of Lincoln Council spent £23,724 on wages for suspended staff. Of the ten most prolonged cases in Lincolnshire, three employees were eventually retained and four were dismissed. Three cases are still ongoing.
Bosses at the county council are now reviewing how to speed up investigations into its own staff.
David O'Connor, the county's executive director for performance and governance, said: "We only suspend staff when
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necessary. Such instances are rare. Staff remain innocent until proven guilty.
"There is an investigation and hearing that could be followed by appeals and perhaps an employment tribunal. It would be wrong for us to penalise staff while this is happening.
"We aim to complete cases as soon as possible and 90 per cent of investigations are resolved within a year, with 60 per cent taking less than six months.
Mr O'Connor said seven people were currently suspended out of 5,660 council employees. And he said the most extreme case – of the employee being suspended for 523 days – was because the individual suffered ill health and meetings had to be postponed.
But John O'Connell, research director at Taxpayers' Alliance said he was surprised by the high figure for Lincolnshire .
"You look behind these rocks sometimes and you find loads of little nasties like this," he said.
"You hear about these things and just think it's a one-off. But once you dig deeper, as we have done, this kind of spending of taxpayers' money seems to go on all over the place."