Yes, I did make a comment on how long each stage of the process can take. Two years from acquiring the right to build on a piece of land to being done is fast. It is why building firms are so frustrated with the UK planning process and with ministers who issues bland 'We will build xxx homes this year' type of statements. That move in of Summer 2021 is only feasible if we are not forced into a (long) public enquiry.
It is why, looking at the CCFC situation, any talk of a new stadium could not contemplate being ready, even if the process started now (and it hasn't been), before the start of the 2023 season, leaving CCFC homeless for four years. Throw in vociferous and determined opposition from locals, and add a few more years to that. Talk of a new stadium for CCFC is, therefore, simply pie in the sky. Spurs took ages to get permission to build their new stadium, and still it opened, what, 8 months late?
Wasps, in applying for JUST a two year extension, are leaving very little wriggle room, but publicly, to even ask for so long an extension was likely to cause some sad faces at the delay. How much worse if they were more realistic and asked for three years? Could it be ready by Summer 2020? Yes. But there would have to be no delays, a very quick environmental report completion, fast turnaround with the planning at the council, and super fast building works. Possible, but unlikely.