The Duke and Duchess of Sussex have come under pressure to "give up" Frogmore Cottage, their former UK home on the Windsor Castle estate - which they recently upgraded to the tune of £2.4m.
This comes after they signed a deal to make films and TV programmes for streaming giant Netflix - worth a rumoured £100 million.
The couple are in the process of paying back the money they received from the taxpayer to renovate Frogmore Cottage at a rate of £18,000 a month.
At this rate, £216,000 a year, it will take them 11 years to repay the British taxpayer.
They recently bought an £11m home in Santa Barbara, California, with a £7.5m mortgage, after previously staying in a Hollywood mansion owned by actor and producer Tyler Perry.
Earlier this week, it was announced Harry and Meghan had signed a Netflix deal to create content including documentaries, films and kids' shows.
Sir Geoffrey Clifton-Brown, deputy chair of parliament's Public Accounts Committee, said the agreement over Frogmore Cottage should be "modified" to pay the taxpayer back quicker.
"I've read all the facts of the case and clearly anyone who has borrowed taxpayers' cash needs to pay it back as quickly as possible," he told The Telegraph.
He went on: "£2.4m is a lot of money and even if you paid back £250,000 a year it would still take a a decade."
The Conservative MP for the Cotswolds added: "If the figures associated with the Netflix deal are correct then there is a case for it being paid back over five years rather than more than 10.
"These sorts of sums are out of the reach of the vast majority of people in this country who have been trying to make ends meet during the coronavirus crisis."
He added that many people "will think that if the couple aren't carrying out royal duties - and are making a lot of money in America, then they should start paying it back sooner".
Harry and Meghan lived in Frogmore Cottage for just eight months following the expensive renovations before announcing they were stepping down as senior members of the Royal Family back in January.
The five-bedroom home hosted the couple's wedding reception in May 2018 before undergoing extensive remodelling to turn it into a single mansion before the couple moved there in April last year.
Following crisis talks at Sandringham to work out the terms of the "Megxit" deal, it was decided they would keep Frogmore as their UK home by continuing to rent from the Queen, who owns the property.
Daily Star Online has approached a spokesperson for the Sussexes for comment.