Most City of Sacramento ones take about 3 weeks minimum while unincorporated Sacramento county (ala Arden-Arcade, Orangvale, North Highlands, North Natomas, Antelope, Carmichael, Vineyard, etc) ones are pretty quick. Most were applied in april / may with the early birds being march. Taking advantage of county GIS data to locate exact addresses now... up to 120 applied / pending / issued in the market of approximately 500. Total applications cover about 21%ish of known cell sites in the market.
Once the permit is issued though... nobody knows. If other markets are any indication, some crews can finish everything in a few days and have it accepted in a week or two. Other times, it can take weeks, even months to get everything done (the longest was 15 months).