Former PM Liz Truss left Downing Street after just a few weeks.Liz Truss has attracted further mockery from her online critics today after trying to predict how long Keir Starmer will be in office.The former prime minister – who holds the record for the shortest tenure in No.10 ever, having spent just 49 days in Downing Street – hit out at the Labour PM after his latest bid to crackdown on immigration.Responding to Starmer’s promise to cut net migration significantly by the end of the decade, Truss wrote: “He’ll be out of office by then.”The prime minister has already been in office for 311 days, since July 5 last year. That’s more than six times longer than Truss spent in the same post.She was kicked out by her own MPs in October 2022 after her disastrous mini-Budget, complete with £45bn of unfunded tax cuts, sent the pound into decline and the markets into turmoil.Truss subsequently lost her seat in the July ge