Around here, typical to have 1 to 3 federal races, 5 to 8 statewide offices, 10 to 20 county and municipal contests, a handful of judge retention questions, and 1 to 20 other referendums. About half the races are usually uncontested.
It may take some time to fill out a ballot paper. But the act of voting itself is inserting the ballot paper into the locked and monitored ballot box, which takes a second or two.
My polling place is filled with tables and chairs and cardboard privacy dividers, but has just one ballot box, with a scanner-tabulator on top of it.
The electronic voting machines that take the place of the paper ballot are the problem. You need dozens per polling place, and each one is expected by design to be alone with a voter, with physical access and privacy, for tens of minutes. I presume by default that any jurisdiction using them is actively promoting the hacking of their own elections, and such presumption must be rebutted only by exposure of the facts of the process that would mistrust the communications coming from those boxes as compromised and potentially malicious. I cannot fathom how it would even be possible to secure such devices. At least the scanner-tabulators attached to ballot boxes can be watched continuously.