The phrase "a week perhaps" is correct and usable in written English.
It can be used when suggesting a time frame that is uncertain or flexible, indicating that a week is a possible duration.
Example: "I could finish the project in a week perhaps, depending on the resources available."
Alternatives: "maybe a week" or "possibly a week".
And you stick to it, for a week, perhaps longer.
"A brewery would be looking for a turnover of £10,000 a week, perhaps £15,000.
Big snow was coming, and the road to Fort Pierre would be impassable, perhaps for a week, perhaps for the entire winter.
That's a harder question, and there's reason to think that Congress can hold out for quite some time — a week, perhaps more.
"When a team tries to trade you three times in a week, perhaps they don't want you," Walker said at the time.
The students have pledged to forgo solid food for at least a week, perhaps longer if the administration does not move to meet some of their demands, which include a five-year moratorium on student fee increases and a rollback of executive salaries to 1999 levels.
Roddick, the eighth seed, has played with renewed energy all week, perhaps as a result of his lighter schedule this season.
A long week perhaps caught up with Kuznetsova in the final, after she battled through three sets in four of the five matches she won to get to the final, including her fourth-round victory over world No1 Serena Williams.
It was a sad week, perhaps, for the Bancroft family - that paternal clan of old-time warriors who fought valiantly to maintain the independent integrity of the Wall Street Journal.
On average, they make about 500 pounds of sausage per week, perhaps a third of what they produced decades ago.
And if the American body politic doesn't experience a complete meltdown this week, perhaps others will notice.
