Change expected wait time for account creation in FAQ (steemit#1619)

The FAQ says accounts could take 'up to three business days' to create, but many are taking a lot longer than that. In the #help channel of Steemit.chat, we are asking users to wait up to a week before reporting it as an issue. This pull request updates the FAQ to let users know it will take up to a week.

src/app/help/en/faq.md

@@ -286,9 +286,9 @@ You will need to provide your email address and phone number.
 <a class="anchor" name="How_long_does_the_account_approval_process_take"></a>
 ## How long does the account approval process take?
 
-Most accounts are approved within 24 hours. Some may take up to three business days.
+Most accounts are approved within 24 hours. Some may take up to a week.
 
-If your account has not been approved after three business days, please ask for help in the <a href="https://steemit.chat/channel/help">#help</a> channel on <a href="https://steemit.chat/home">steemit.chat</a>.
+If your account has not been approved after one week, please ask for help in the <a href="https://steemit.chat/channel/help">#help</a> channel on <a href="https://steemit.chat/home">steemit.chat</a>.
 
 <a href="/faq.html#Table_of_Contents_Accounts">^</a>
 <a class="anchor" name="Why_do_I_need_to_provide_my_email_and_phone_number"></a>