I didn't put a time frame on it, some people might think it'll be years before he's sacked.
Anyway The Athletic have a detailed piece on the process Utd went through before finally deciding to stick with ETH:
This is the full story of how close Manchester United came to sacking Ten Hag, who they considered as replacements, and why he stayed
www.nytimes.com
Some bullet points for those that don't subscribe:
- Utd initially planned to keep ETH next season (presumably this was pre May).
- Following a run of poor results Utd considered sacking him after the Palace defeat on the 12th May.
- Board meeting held on the 14th May with a consensus to sack him at the end of the season.
- ETH was excluded from certain meetings around pre-season plans, recruitment and decisions on which (soon to be) out of contract players to retain or release.
- Utd met with Kieran McKenna before the FA Cup final, fearing that Chelsea were going to steal a march on them only for him to stay at Ipswich.
- Thomas Frank, Marco Silva, Poch and Tuchel also met with Utd the week of the FA Cup final and De Zerbi was also sounded out.
- By the first week of June Poch was out of the running however Tuchel made a positive impression and Utd discussed financial terms with him before he Tuchel stepped out of the process.
- Financial terms were also discussed with De Zerbi but Utd decided he wasn't the right fit.
- After all that Utd returned to the first bullet point. The season was well below expectations but injuries were seen as mitigation and bringing through Garnacho & Mainoo counted in his favour.
Long story short, they decided to sack him, spoke to every manager going but seemingly only Tuchel (maybe McKenna too) took their fancy and when he said no they decided to stay with ETH.