How long does it take to get back to the inbox?
Typically, it takes two weeks on a new domain. Regarding older domains, the process can take up to thirty days. After the initial repair/warmup, there is no downtime.
What service/platform does this work with?
Inbox Ignite works with all services/platforms. Whether you are sending from G-Suite, Outlook365, SendGrid, Klaviyo, MailChimp... Inbox Ignite will increase your inbox deliverability.