3 articles
Most timeline articles hand you a range and stop there. This one shows you where every week of a website project actually goes, names the four things behind almost every delay, and puts a cost in days on each of them. Read it before you sign anything, because it will tell you whether the date you have been quoted is a real plan or a hopeful one.
Your update has said eighty percent for three months and you have no way to test whether that is true. This article gives you five checks you can run in an afternoon with no technical knowledge, the simple arithmetic that turns finished work into an honest launch date, the real split of effort hiding behind the screens, and the four levers left when you discover you are behind, including the point where stopping is the right answer.
Most answers to this question stop at a vague three to six months. This one gives you the week by week arithmetic for three real sizes of app, then covers the part that actually makes launches slip: the developer accounts, the privacy questionnaire, the reviewer test account and the store rules Apple and Google apply before anybody is allowed to download what you have paid for.
