SANTA CLARA – Time to pack for Las Vegas, but first, let’s unpack 49ers fans‘ questions for this mailbag ahead of Thursday’s practice at the Raiders’ facility and Saturday’s preseason affair at Allegiant Stadium:

How many offensive series will Brock Purdy play? (@andrew.liu.87)

Coach Kyle Shanahan likely will say that Purdy’s playing time depends on how he fares in Thursday’s 8:45 a.m. practice, as the temperature rises from 90s to 100. He played three series (with one first down) in last year’s second preseason game against the Saints, and he executed one long series (nine plays) in the previous year’s Week 2 preseason matchup against Denver.

“I always love getting it just to get the feel for warming up for a game, how it feels dropping back, 11-on-11, in the stadium, with the shot clo

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